| DTC Data Sheet | |
| System | Powertrain |
| Standard | SAE J2012 / ISO 15031-6 |
| Fault type | Circuit Low |
| Official meaning | Camshaft Position Sensor "A" Circuit Low Input (Bank 1) |
The bank 1 CMP signal voltage is below the minimum threshold. Indicates a short to ground, open signal circuit, or a failed sensor with no output.
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P0342 Quick Answer
The bank 1 CMP signal voltage is below the minimum threshold. Indicates a short to ground, open signal circuit, or a failed sensor with no output.
What Does P0342 Mean?
Camshaft Position Sensor "A" Circuit Low Input (Bank 1). The bank 1 CMP signal voltage is below the minimum threshold. Indicates a short to ground, open signal circuit, or a failed sensor with no output.
Symptoms
- No-start or extended-crank condition
- Stalling shortly after start
- Random misfires while running
- Check engine light
Common Causes
- Open CMP signal wire
- Short to ground on the signal wire
- Failed CMP sensor (open internally)
- Loss of sensor power supply
- Connector corrosion or damaged terminal
Diagnosis Steps
You’ll need a scan tool capable of reading live powertrain data, a digital multimeter, and access to the wiring diagram for the specific platform.
- Disconnect CMP connector, key on. Verify supply voltage (typically 5 V or 12 V) at the supply pin and a clean ground at the ground pin.
- Continuity-test the signal wire to the PCM.
- Measure CMP coil resistance if applicable.
- Inspect connector for corrosion or oil contamination.
Possible Fixes
- Replace CMP sensor
- Repair open or shorted signal wiring
- Connector terminal repair
Can I Still Drive With P0342?
The vehicle will usually still drive with P0342 stored, but performance, drivability, or emissions will be degraded. The PCM may inhibit emissions monitors and limit closed-loop fueling adjustments. Drive to a workshop, but don’t ignore the code long-term.
How Serious Is This Code?
P0342 is a moderate-priority fault. It will not prevent the engine from running, but unaddressed it can cascade into related faults or damage downstream components such as the catalytic converter. Address within a few drive cycles.
FAQ
Will P0342 clear itself?
Only if the underlying fault was intermittent and self-corrected. Most root causes are persistent and require physical repair.
Can I clear P0342 without fixing it?
You can clear it with a scan tool, but it will return as soon as the fault condition reappears — typically within one or two drive cycles.
Is P0342 related to other codes?
Often, yes. Adjacent codes in the same circuit or system frequently set together — if P0342 is present, scan for related codes and address them as a group.