Timing Reference High Resolution Signal A No Pulses
The P0374 code indicates that the Powertrain Control Module (PCM) has detected a loss of the high-resolution timing signal from the crankshaft position sensor (CKP) or camshaft position sensor (CMP). This signal is critical for engine timing and fuel injection synchronization. Without it, the PCM cannot determine the exact position of the crankshaft or camshaft, leading to a no-start or rough running condition.
01. Most Common Causes
- Faulty crankshaft position sensor
- Faulty camshaft position sensor
- Wiring or connector issues in the sensor circuit
- Damaged reluctor ring or tone wheel
02. Symptoms You Will Notice
- Engine cranks but does not start
- Engine misfires or runs poorly
- Check Engine Light illuminated
- Possible stalling
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Inspect the wiring and connectors for the crankshaft and camshaft position sensors for damage, corrosion, or loose connections.
Step 3: Test the sensor output voltage using a multimeter or oscilloscope while cranking the engine.
Step 4: Check the reluctor ring for damage or debris that could affect the signal.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may stall or fail to start, leading to a dangerous situation. Have it diagnosed and repaired immediately.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the specific sensor and labor rates.