Chevrolet Trax: DTC P057B-P057D
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category
DTC Descriptors
DTC P057B
Brake Pedal Position Sensor Performance
DTC P057C
Brake Pedal Position Sensor Circuit Low Voltage
DTC P057D
Brake Pedal Position Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Brake Pedal Position Sensor
Circuit/System Description
The brake pedal position (BPP) sensor is part of the engine brake pedal
override feature. The engine control
module (ECM) continuously monitors the vehicle speed and the position of the
brake pedal. These two main
inputs, along with other ECM inputs are used to determine if the vehicle is
decelerating at the proper speed and
rate with the brake pedal applied. When the engine brake pedal override system
is active, the ECM reduces
engine torque to assist in reducing vehicle speed.
The BPP sensor is a six wire sensor, and is part of a dual brake position
sensor. One BPP Sensor is used for the
stop lamps and the other BPP Sensor is used for the engine brake pedal override
feature. The BPP Sensor for
engine brake pedal override communicates with the ECM. The ECM supplies a 5 V
reference circuit, low
reference circuit, and signal circuit to the BPP sensor. The BPP sensor sends a
voltage signal to the ECM on the
signal circuit. The voltage on the signal circuit will vary from a voltage
greater than 0.25 V when the brake
pedal is released to a voltage less than 4.75 V when the brake pedal is fully
applied.
For information on the Stop Lamps side of the BPP Sensor, refer to Exterior
Lighting Systems Description
and Operation .
Conditions for Running the DTC
- Ignition voltage is greater than 10 V.
- DTC runs continuously when above condition is met.
Conditions for Setting the DTC
P057B
ECM detects the BPP sensor signal is stuck in a range.
P057C
ECM detects the BPP sensor voltage is less than 0.25 V for 1 s.
P057D
ECM detects the BPP sensor voltage is greater than 4.75 V for 1 s.
Action Taken When the DTC Sets
- P057B, P057C, and P057D are Type A DTCs.
- Engine torque is reduced to 50% of available engine torque during brake
torque management.
- Brake torque management is active at 25 kPa (3.7 PSI) of brake apply
pressure.
Conditions for Clearing the DTC
P057B, P057C, and P057D are Type A DTCs
Reference Information
Schematic Reference
- Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)
- Exterior Lights Schematics (Encore) , Exterior Lights Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain
Diagnostic Trouble Code
(DTC) Type Definitions (2H0)
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON.
- Verify DTC P0641, P0651, P0697, or P06A3 is not set.
- If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If none of the DTCs are set
- Transmission in Park, and service brake pedal released.
- Verify the scan tool Brake Pedal Position Sensor parameter in the ECM
displays greater than 0.25 V.
Refer to Circuit/System Testing.
- Verify the scan tool Brake Pedal Position Sensor parameter voltage
changes as the brake pedal is applied
and displays less than 4.75 V when the brake pedal is fully applied.
- If the voltage does not change, or is greater than 4.74 V
Refer to Circuit/System Testing.
- If the voltage changes and less than 4.75 V
- Verify the scan tool Brake Pedal Position Sensor Learned Release
Position parameter is within 0.1 V of
the Brake Pedal Position Sensor parameter when the brake pedal is fully
released.
- If difference is greater than 0.1 V
Perform the Brake Pedal Position Sensor Learn .
- If difference is 0.1 V or less
- Verify the Brake Pedal Position Sensor parameter transitions smoothly
without any spikes or dropouts
when slowly applying and releasing the brake pedal.
- If parameter does not transition smoothly or has spikes or dropouts
Refer to Circuit/System Testing.
- If parameter transitions smoothly and there are no spikes or dropouts
- Operate the vehicle within the Conditions for Running
the DTC. You may also operate the vehicle within
the conditions that you observed from the Freeze Frame/Failure Records data.
- Verify the DTC does not set.
Refer to Circuit/System Testing.
- All OK.
Circuit/System Testing
NOTE: You must perform the Circuit/System
Verification first.
- Ignition OFF and all vehicle systems OFF, disconnect the
harness connector at the B22 Brake Pedal
Position Sensor. It may take up to 2 minutes for all vehicle systems to
power down.
NOTE: All terminal references are for the vehicle
harness brake pedal position
sensor connector.
- Test for less than 10 ohms between the low reference
circuit terminal 6 and ground.
- Disconnect the harness connector at the K20 Engine
Control Module.
- Test for less than 2 ohms in the low reference circuit
end to end.
- If 2 ohms or greater, repair the open/high resistance in
the circuit.
- If less than 2 ohms, replace the K20 Engine Control
Module.
- If less than 10 ohms
- Ignition ON.
- Test for 4.8-5.2 V between the 5 V reference circuit
terminal 5 and ground.
- Ignition OFF, disconnect the harness connector at the
K20 Engine Control Module.
- Test for infinite resistance between the 5 V reference
circuit and ground.
- If less than infinite resistance, repair the short to
ground on the circuit.
- If infinite resistance.
- Test for less than 2 ohms in the 5 V reference circuit
end to end.
- If 2 ohms or greater, repair the open/high resistance in
the circuit.
- If less than 2 ohms, replace the K20 Engine Control
Module.
- If greater than 5.2 V
- Ignition OFF, disconnect the harness connector at the
K20 Engine Control Module, ignition ON.
- Test for less than 1 V between the 5 V reference circuit
and ground.
- If 1 V or greater, repair the short to voltage on the
circuit.
- If less than 1 V, replace the K20 Engine Control Module.
- If between 4.8-5.2 V
- Verify the scan tool Brake Pedal Position Sensor
parameter is less than 0.25 V.
- Ignition OFF, disconnect the harness connector at the
K20 Engine Control Module, ignition ON.
- Test for less than 0.25 V between the signal circuit
terminal 4 and ground.
- If 0.25 V or greater, repair the short to voltage on the
circuit.
- If less than 0.25 V, replace the K20 Engine Control
Module.
- If less than 0.25 V
- Install a 3 A fused jumper wire between the signal
circuit terminal 4 and the 5 V reference circuit
terminal 5.
- Verify the scan tool Brake Pedal Position Sensor
parameter is greater than 4.8 V.
- Ignition OFF, remove the jumper wire, and disconnect the
harness connector at the K20 Engine
Control Module.
- Test for infinite resistance between the signal circuit
terminal 4 and ground.
- If less than infinite resistance, repair the short to
ground on the circuit.
- If infinite resistance.
- Test for less than 2 ohms in the signal circuit end to
end.
- If 2 ohms or greater, repair the open/high resistance in
the circuit.
- If less than 2 ohms, replace the K20 Engine Control
Module.
- If greater than 4.8 V
- Replace the B22 Brake Pedal Position Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing
the repair.
- Brake Pedal Position Sensor Replacement
- Perform the Brake Pedal Position Sensor Learn following
the replacement of the ECM or BPP sensor,
or any repair that effects the BPP sensor alignment.
- Control Module References for Engine Control Module
replacement, programming and setup.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior
to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of
the diagnostic approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
This vehicle is equipped with a shift
lock control. The shift lock control is
designed to:
Prevent ignition key removal
unless the shift lever is in
P (Park) with the shift lever
button fully released.
Prevent movement of the shift
lever out of P (Park) unless the
ignition is in ON/RUN and t
The names, logos, emblems,
slogans, vehicle model names, and
vehicle body designs appearing in
this manual including, but not limited
to, GM, the GM logo, CHEVROLET,
the CHEVROLET Emblem, and
TRAX are trademarks and/or
service marks of General Motors
LLC, its subsidiaries, affiliates,
or licensors.