Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test C: P2535
- Refer to STARTING SYSTEM
for schematic and connector information.
Normal Operation and Fault Conditions
When the ignition is turned to the START position the PCM receives a voltage signal on the crank detect circuit. When the required inputs have been received, the PCM supplies voltage and ground to the starter relay coil.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition PCM P2535:00 Ignition Switch On/Start Position Circuit High: No Sub Type Information This DTC is set when the PCM detects a short to voltage on the crank detect circuit while engine is running. Possible Sources
- Ignition switch
- PCM
- Wiring, terminals or connectors
Visual Inspection and Pre-checks
- Verify the BCM fuse 20 (5A).
- C1 RETRIEVE DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, perform PCM self-test.
Is PCM DTC P2535 present?
Yes GO to C2 No For all other PCM Diagnostic Trouble Codes (DTCs), REFER to the appropriate PCM DTC Chart. - C2 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE PCM (POWERTRAIN CONTROL MODULE) DISCONNECTED
- Ignition OFF.
- Disconnect PCM C1551B.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C1551B-22 Ground
Is any voltage present?
Yes GO to C3 No GO to C5 - C3 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE ACM (AUDIO FRONT CONTROL MODULE) DISCONNECTED
- Ignition OFF.
- Disconnect Ignition switch C250.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C1551B-22 Ground
Is any voltage present?
Yes GO to C3 No INSTALL a new ignition switch. REFER to: Ignition Switch . - C4 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE BCM (BODY CONTROL MODULE) DISCONNECTED
- Ignition OFF.
- Disconnect BCM C2280B.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C1551B-22 Ground
Is any voltage present?
Yes GO to C4 No INSTALL a new BCM. - C5 CHECK THE CRANK DETECT CIRCUIT FOR A SHORT TO VOLTAGE WITH THE IGNITION SWITCH DISCONNECTED
- Ignition OFF.
- Disconnect Ignition switch C250.
- Measure:
Positive Lead Measurement / Action Negative Lead C175B-22 Ground
Is any voltage present?
Yes REPAIR the circuit. No INSTALL a new ignition switch. REFER to: Ignition Switch . - C6 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect all PCM connectors.
- Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the PCM connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, PCM GUIDED ROUTINE TESTING No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.