B1127 Chevrolet Four Ninety OBD Code

OBD/2 B1127 error code description and symptoms.

Brake Switch Circuit Input Malfunction Indicates PCM did not receive a brake pedal position (BPP) input. Open or short in BPP circuit Open or short in stoplamp circuits Damaged PCM Malfunction in module(s) connected to BPP circuit. (Rear Electronic Module [REM] Windstar and LS6/LS8 or Lighting Control Module (LCM) Continental and Town Car. Damaged brake switch Misadjusted brake switch Check for proper function of stoplamps.

At this point we are assuming that the fuses and relays are good. You will need to locate the PCM/TCM and the power input signal circuit using your vehicle information source. Unplug the connector from the PCM/TCM, place the ignition switch in the ON position, and probe the appropriate circuit with the positive test lead of the DVOM.

B1127 Chevrolet Four Ninety Error Code Repair Process :

If your vehicle failed a B1127 test and the B1127 Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses servo motor potentiometer defrost circuit short to battery a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look servo motor potentiometer defrost circuit short to battery: Any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature.

Common Causes of Chevrolet Four Ninety B1127 OBD2 Code

A common cause of code B1127 is the failure of Servo Motor Potentiometer Defrost Circuit Short To Battery, but there are several other possible causes as well, such as ;

Failures of clutch motion/travel sensors.
Faulty starter motor
Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
Oil flow restriction in the oil passages or the variable camshaft timing (VCT) valve body

B1127 is a kind of Body Trouble Code

Auto body problems aren't always easy to spot. Diagnosing auto body problems sometimes requires a little know-how. In this section you'll find articles dedicated to teaching you how to diagnose auto body problems.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

About Us | Contact | Privacy

B1127 Chevrolet Four Ninety OBD Code

B1127 Chevrolet Four Ninety Error Code Repair Process :

Common Causes of Chevrolet Four Ninety B1127 OBD2 Code

B1127 code for other Chevrolet cars