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Makes 🢒 Chevrolet 🢒 1999 🢒 Chevy P32 RV/Van Chassis 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L80-E 🢒 Diagnostic Trouble Code Identification

Diagnostic Trouble Code Identification Gas

Diagnostic Trouble Code (DTC) Identification Diagnostic Types

DTC

Description

DTC Type*

Default Action

P0218

Transmission Fluid Overtemperature

D

The VCM freezes shift adapts.

P0502

Vehicle Speed Sensor Circuit -- Low Input

D/B
    • The VCM illuminates the MIL for California emissions.
    • The VCM freezes shift adapts.
    • The VCM commands maximum line pressure
    • The VCM defaults a calculated OSS from the A/T ISS sensor output.

P0503

Vehicle Speed Sensor Circuit -- Intermittent

D/B
    • The VCM illuminates the MIL for California emissions.
    • The VCM freezes shift adapts.
    • The VCM commands maximum line pressure.
    • The VCM defaults a calculated OSS from the A/T ISS sensor output.

P0560

System Voltage Malfunction

D
    • The VCM commands an immediate landing to second gear.
    • The VCM freezes shift adapts.
    • The VCM turns off all transmission output devices.

P0711

Automatic Transmission Fluid Temperature (TFT) Sensor Circuit Range/Performance

D
    • The VCM freezes shift adapts.
    • Default line pressure.
    • The VCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time.

P0712

Transmission Fluid Temperature Sensor Circuit -- Low Input

D
    • The VCM freezes shift adapts.
    • Default line pressure.
    • The VCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time.

P0713

Transmission Fluid Temperature Sensor Circuit -- High Input

D
    • The VCM freezes shift adapts.
    • Default line pressure.
    • The VCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time.

P0716

Input Speed Sensor Circuit -- Intermittent

D/B
    • The VCM illuminates the MIL for California emissions.
    • The VCM freezes shift adapts.
    • The VCM commands maximum line pressure.

P0717

Input Speed Sensor Circuit -- Low Input

D/B
    • The VCM illuminates the MIL for California emissions.
    • The VCM freezes shift adapts.
    • The VCM commands maximum line pressure.

P0719

Brake Switch Circuit -- Low Input

D

--

P0724

Brake Switch Circuit -- High Input

D

--

P0730

Incorrect Gear Ratio

D
    • The VCM commands maximum line pressure.
    • The VCM freezes shift adapts.

P0741

Torque Converter Clutch System Stuck Off

D/B
    • The VCM illuminates the MIL for California emissions.
    • Default line pressure.
    • The VCM inhibits TCC engagement.
    • The VCM inhibits fourth gear engagement.

P0742

Torque Converter Clutch System Stuck On

D/B
    • The VCM illuminates the MIL for California emissions.
    • The VCM commands maximum line pressure.
    • The VCM freezes shift adapts.

P0748

Pressure Control Circuit -- Electrical

D
    • The VCM disables the PC Solenoid valve.
    • The VCM freezes shift adapts.

P0751

1-2 Shift Solenoid Valve -- Performance

D/B
    • The VCM illuminates the MIL for California emissions.
    • The VCM commands maximum line pressure.
    • The VCM freezes shift adapts.
    • 3-2 downshifts above 25 MPH are inhibited.

P0753

1-2 Shift Solenoid Valve Circuit -- Electrical

D/A
    • The VCM illuminates the MIL for California emissions.
    • The VCM freezes shift adapts.
    • 3-2 downshifts above 25 MPH are inhibited.
    • The VCM commands maximum line pressure.

P0756

2-3 Shift Solenoid Valve -- Performance

D/A
    • The VCM illuminates the MIL for California emissions.
    • The VCM commands an immediate landing to second gear.
    • The VCM freezes shift adapts.
    • The VCM commands maximum line pressure.

P0758

2-3 Shift Solenoid Valve Circuit-- Electrical

D/A
    • The VCM illuminates the MIL for California emissions.
    • The VCM commands maximum line pressure.
    • The VCM freezes shift adapts.
    • The VCM commands an immediate landing to second gear.

P1810

Automatic Transmission Fluid Pressure Manual Valve Position Switch Circuit Malfunction

D/B
    • The VCM illuminates the MIL for California emissions.
    • The VCM freezes shift adapts.
    • The VCM assumes D4 shift pattern.
    • The VCM commands maximum line pressure.
    • The VCM forces TCC apply when fourth gear is commanded.

P1860

Torque Converter Clutch Pulse Width Modulation Solenoid Valve Circuit-Electrical

D/A
    • The VCM illuminates the MIL for California emissions.
    • The VCM inhibit s TCC engagement.
    • The VCM inhibits fourth gear engagement.
    • The VCM freezes shift adapts.

P1870

Transmission Component Slipping

D/B
    • The VCM illuminates the MIL for California emissions.
    • The VCM commands maximum line pressure.
    • The VCM inhibits TCC engagement.
    • The VCM inhibits fourth gear engagement.
    • The VCM freezes shift adapts.

P1875

Four-Wheel Drive Low Switch Circuit Electrical

D/B
    • The VCM illuminates the MIL for California emissions.
    • The VCM freezes shift adapts.
    • The VCM assumes a 4WD Lo state if the switch fails when open, or the VCM assumes a 4WD High state if the switch fails when closed, for a transmission shift pattern.
    • The VCM inhibits fourth gear engagement.
    • The VCM freezes shift adapts.

*DTC Types:

A--Emission related, will turn on the MIL after the first failure.

B--Emission related, will turn on the MIL after two consecutive trips with a failure.

C--Non-emission related, will turn on the service lamp after the first failure.

D--Non-emission related, no lamps.

Diagnostic Trouble Code Identification L57/L65 EFI

Diagnostic Trouble Code (DTC) Identification Diagnostic Types

DTC

Description

DTC Type*

Default Action

P0218

Transmission Fluid Overtemperature

D

The PCM freezes shift adapts.

P0560

System Voltage Malfunction

D
    • The PCM inhibits TCC engagement.
    • The PCM freezes shift adapts.
    • The PCM turns off the PC solenoid valve.
    • The PCM commands an immediate landing into 2nd gear.

P0711

Transmission Fluid Temperature Sensor Circuit Range/Performance

D
    • The PCM freezes shift adapts.
    • Default line pressure.
    • The PCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time.

P0712

Transmission Fluid Temperature Sensor Circuit -- Low Input

D
    • The PCM freezes shift adapts.
    • Default line pressure.
    • The PCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time.

P0713

Transmission Fluid Temperature Sensor Circuit -- High Input

D
    • The PCM freezes shift adapts.
    • Default line pressure.
    • The PCM calculates a default transmission fluid temperature based on engine coolant temperature, intake air temperature and engine run time.

P0716

Input Speed Sensor Circuit -- Intermittent

B
    • The PCM illuminates the MIL.
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure.

P0717

Input Speed Sensor Circuit -- Low Input

B
    • The PCM illuminates the MIL.
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure.

P0719

Brake Switch Circuit -- Low Input

D

--

P0722

Output Speed Sensor -- Low Input

B
    • The PCM illuminates the MIL.
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure.
    • The PCM calculates OSS from ISS.

P0723

Output Speed Sensor Intermittent

B
    • The PCM illuminates the MIL.
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure.
    • The PCM calculates OSS from ISS.

P0724

Brake Switch Circuit -- High Input

D

Apply TCC if APP is greater than 0.5% and the vehicle speed is greater than 30 mph.

P0730

Incorrect gear ratio

D
    • The PCM commands maximum line pressure.
    • The PCM freezes shift adapts.

P0741

Torque Converter Clutch System Stuck Off

B
    • The PCM illuminates the MIL.
    • The PCM inhibits TCC engagement.
    • The PCM inhibits fourth gear engagement.
    • The PCM commands increased line pressure.

P0742

Torque Converter Clutch System Stuck On

B
    • The PCM illuminates the MIL.
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure.

P0748

Pressure Control Solenoid Circuit -- Electrical

D
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure by disabling the PC solenoid valve.

P0751

1-2 Shift Solenoid Valve --Performance

B
    • The PCM illuminates the MIL.
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure.

P0753

1-2 Shift Solenoid Valve -- Electrical

A
    • The PCM illuminates the MIL.
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure.

P0756

2-3 Shift Solenoid Valve -- Performance

A
    • The PCM illuminates the MIL.
    • The PCM commands an immediate landing into second gear.
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure.

P0758

2-3 Shift Solenoid Valve -- Electrical

A
    • The PCM illuminates the MIL.
    • The PCM commands an immediate landing to second gear.
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure.

P1810

Transmission Fluid Pressure Manual Valve Position Switch Assembly -- Circuit Malfunction

B
    • The PCM illuminates the MIL.
    • The PCM freezes shift adapts.
    • The PCM assumes a D4 shift pattern.
    • The PCM commands maximum line pressure.
    • The PCM commands TCC apply with 4th gear commanded ON.

P1811

Maximum Adapt and Long Shift

D
    • The PCM freezes shift adapts.
    • The PCM commands maximum line pressure.

P1860

Torque Converter Clutch Pulse Width Modulation Solenoid Circuit -- Electrical

A
    • The PCM illuminates the MIL.
    • The PCM inhibits TCC engagement.
    • The PCM inhibits fourth gear engagement.
    • The PCM freezes shift adapts.

P1870

Transmission Component Slipping

B
    • The PCM illuminates the MIL.
    • The PCM commands maximum line pressure.
    • The PCM inhibits TCC engagement.
    • The PCM inhibits fourth gear engagement.
    • The PCM freezes shift adapts.

P1875

Four-Wheel Drive Low Switch Circuit -- Electrical

B
    • The PCM illuminates the MIL.
    • The PCM freezes shift adapts.
    • The PCM assumes a 4WD Lo state if the switch fails when open, or the PCM assumes a 4WD High state if the switch fails when closed, for a transmission shift pattern.
    • DTC P1875 is stored in PCM history.

DTC Types:

  • A--Emission related, will turn on the MIL after the first failure.
  • B--Emission related, will turn on the MIL after two consecutive trips with a failure.
  • C--Non-emission related, will turn on the service lamp after the first failure.
  • D--Non-emission related, no lamps.

Diagnostic Trouble Code Identification L57 MFI

Diagnostic Trouble Code (DTC) Identification Diagnostic Types

DTC

Description

Default Action

21

Throttle Position Sensor Circuit High Voltage
    • Set line pressure to maximum
    • Use 35% throttle as a default
    • Inhibit fourth gear if in Hot Mode

22

Throttle Position Sensor Circuit Low Voltage
    • Set line pressure to maximum
    • Use 35% throttle as a default
    • Inhibit fourth gear if in Hot Mode

24

Output Shaft Speed (OSS) Sensor Low
    • Set line pressure to maximum
    • Allow 4-3, 3-2, and 1-2 shifts, then maintain second gear
    • Calculate output speed from input speed

28

TFP Valve Position Switch
    • Assume Drive 4 is selected
    • Inhibit fourth gear if in Hot Mode
    • Inhibit TCC operation

37

TCC Brake Switch Low Input
    • No TCC
    • No fourth gear if in Hot Mode

38

TCC Brake Switch High Input
    • No TCC
    • No fourth gear if in Hot Mode

39

Torque Converter Clutch (TCC) Stuck OFF

Inhibit fourth gear if in Hot Mode

51

Prom Error

--

52

System Voltage High Long
    • Maximum line pressure
    • 2nd gear landing
    • Inhibit TCC

53

System Voltage High
    • Maximum line pressure
    • 2nd gear only
    • Inhibit TCC operation

58

Transmission Fluid Temperature (TFT) Sensor Circuit High
    • TCC in second, third, and fourth gears
    • Maximum line pressure
    • Defaults to 140°C TFT

59

Transmission Fluid Temperature (TFT) Sensor Circuit Low
    • TCC in second, third, and fourth gears
    • Maximum line pressure
    • Defaults to 140°C TFT

63

BARO Sensor Circuit High

No altitude compensation of shift patterns

64

BARO Sensor Circuit Low

No altitude compensation of shift patterns

68

Transmission Component Slipping
    • Inhibit TCC operation
    • Inhibit manual mode operation

69

Torque Converter Clutch (TCC) Stuck ON

--

71

Camshaft Position Sensor (CMP) Circuit Low (Engine Speed Sensor)

The TCM inhibits TCC

72

Transmission Output Shaft Speed (OSS) Sensor Circuit Loss
    • Maximum line pressure
    • Soft landing into second gear

73

Pressure Control (PC) Solenoid Valve Electrical

Maximum line pressure

74

Automatic Transmission Input Shaft Speed (A/T ISS) Sensor Circuit

The TCM inhibits TCC

75

System Voltage Low
    • Turn pressure control solenoid OFF
    • Allow 4-3, 3-2, and 1-2 shifts, then maintain second gear
    • Inhibit TCC and fourth gear

79

Transmission Fluid Overtemperature

--

81

2-3 Shift Solenoid (2-3 SS) Valve Circuit Fault
    • Inhibit TCC operation
    • Maximum line pressure

82

1-2 Shift Solenoid (1-2 SS) Valve Circuit Fault
    • Second and third gears only
    • Maximum line pressure

83

TCC PWM Solenoid Valve Circuit Fault
    • Inhibit fourth gear if in Hot Mode
    • Inhibit TCC operation

85

Undefined Gear Ratio
    • Maximum line pressure
    • Inhibit TCC

86

Low Ratio Error
    • Defaults to second gear
    • Maximum line pressure
    • Inhibits TCC

87

High Ratio Error
    • Landing to second gear
    • Maximum line pressure
    • Inhibits TCC