What this code means

The PCM has detected a general sensor performance issue affecting fuel metering or engine management. One or more sensor inputs are outside their expected operating range or are providing inconsistent data to the PCM.

Symptoms

• Check Engine Light
• Variable driveability symptoms
• Poor fuel economy
• Rough idle

Common causes

• Faulty MAP or TPS sensor
• Wiring harness damage or corrosion
• Poor ground connections at engine block
• PCM connector corrosion
• Multiple sensor drift due to age

Diagnostic steps

1. Scan for all stored and pending DTCs
2. Check sensor reference voltage at PCM connector (should be 5V)
3. Inspect main engine harness connectors for corrosion
4. Test individual sensor outputs against specifications
5. Verify PCM ground circuits

Repair notes

Identify the specific sensor causing the issue through live data comparison and repair wiring or replace the faulty sensor.

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