P1107moderate severityPowertrain
MAP Sensor Circuit Intermittent Low Voltage
on 2004 GMC Yukon 5.3L V8 Vortec · RWD
What this code means
The PCM detected intermittent low voltage drops from the MAP sensor circuit. This indicates a sporadic loss of signal, often caused by a loose connection.
Symptoms
- Check Engine Light (intermittent)
- Intermittent stalling
- Surging at idle
- Hesitation
Common causes
- Loose MAP sensor connector
- Intermittent open in wiring
- Faulty MAP sensor
- Corroded terminals
Diagnostic steps
- Wiggle test MAP sensor connector while monitoring voltage
- Inspect wiring for breaks
- Test MAP sensor
- Check 5-volt reference supply
Repair notes
Clean connectors and repair any damaged wiring. Replace MAP sensor if faulty.
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