P1338 AUDI, VOLKSWAGEN: CAMSHAFT POSITION SENSOR BANK 1 OPEN CIRCUIT OR SHORT TO POSITIVE
POST UPDATED IN January, 2023
P1338 Code failures by brands
Description of DTC code P1338
The CamshaftPosition Sensor (CMP) is a device that sends information to the Engine Control Module (ECM), which matches the speed at which the camshaft rotates. With the information provided by this sensor, the signal from the CKP Sensor (Crankshaft Position Sensor) is also monitored. With these parameters, the engine timing and fuel injection are controlled and regulated.
When the CMP Sensor does not work properly, a DTC will be set indicating such a situation. In the case of the P1338 OBDII code for Audi and Volkswagen vehicles, it is set if the ECM detects that the CMP Sensor input signal for bank 1 is not within the operating range.
Symptoms of fault code P1338
- The Check Engine light turns on.
- Difficulties during engine start-up.
- Reduction of the engine power.
Causes of OBD2 P1338
Reasons to store the P1338 OBD2 fault code:
- Camshaft Position Sensor wires or connectors may be damaged.
- The Crankshaft Position Sensor circuit may have wiring deficiencies.
- The CMP Sensor or CKP Sensor may be faulty.
- The motor timing may not be correct.
- The ECM may be deficient.
Possible solutions of the DTC code P1338
To solve the P1338 OBDII diagnostic code, try this:
- Consult the Technical Service Bulletins.
- Check the ECM memory for other DTCs set to indicate specific ignition system component faults. These codes should be diagnosed in the order indicated by the scanner.
- Check the wiring and connections of the CMP Sensor and the CKP Sensor. Check all of these for damage caused by corrosion, wear, or burns. Repair or replace as required.
- Measure the power and ground circuit voltages of the CMP Sensor and the CKP Sensor. These readings should match the parameters stated by the manufacturer in their specifications. If you detect an out-of-range value, make the necessary corrections.
