OBD-II Code P0342 — What It Means & How to Fix It

What Does This Error Mean?

P0342 means the camshaft position sensor on Bank 1 is reading a signal that is too low. The camshaft position sensor tells the ECM where the intake and exhaust valves are in their cycle. The ECM uses this information alongside the crankshaft sensor to properly time fuel injection and spark. A low signal means the ECM can't get reliable data — this can cause hard starting, rough running, or stalling. This sensor is critical for proper engine operation.

Affected Models

All vehicles 1996+
Common in Ford and Lincoln vehicles
Common in GM vehicles (Chevrolet, Buick, GMC)
Common in Honda and Acura vehicles
Common in Toyota and Lexus vehicles

Common Causes

Failed camshaft position sensor producing a weak or no output signal
Damaged or corroded wiring to the camshaft position sensor on Bank 1
Loose sensor mounting allowing the air gap between the sensor and camshaft reluctor to become too large
Timing chain or belt that has stretched or jumped, causing the cam signal to be out of phase
Damaged camshaft reluctor wheel with missing or worn teeth

How to Fix It

Scan for all codes. A P0342 alongside P0016 or P0017 (cam/crank correlation fault) is a red flag — it may indicate a jumped timing chain rather than just a failed sensor. If those correlation codes are present, have a mechanic assess timing before replacing the sensor.

Replacing a sensor on an engine with a jumped timing chain will not fix the problem.
Locate the Bank 1 camshaft position sensor. It is typically mounted at the front of the cylinder head or in the timing cover. Unplug the connector and inspect for corrosion, damaged pins, or moisture. Clean and reseat the connector firmly.

Bank 1 is the cylinder head that contains cylinder 1 — usually the driver's side on most American vehicles.
Check the sensor mounting bolt. If the sensor is loose, the gap between the sensor tip and the camshaft reluctor wheel may have increased, weakening the signal. Tighten the bolt and clean off any oil contamination around the sensor base.

A sensor covered in oil can sometimes generate a weakened signal — clean the area before retesting.
Test the camshaft position sensor according to your vehicle's service manual. Hall effect sensors (the most common type) need power, ground, and a working output signal. Use a multimeter to verify the sensor receives proper voltage and has a clean ground.

Most Hall effect cam sensors require 5V reference input. A missing reference means a broken wire from the ECM.
If the sensor receives proper power and ground but still shows P0342, replace the sensor. Use an OEM or quality brand sensor. After replacement, clear the code and drive through a complete warm-up cycle to verify the fix.

On variable valve timing engines, also check that the VVT solenoid is functioning — a stuck VVT solenoid can interfere with the cam signal.

When to Call a Professional

If the connector and visible wiring are fine but the code persists, have a mechanic test the sensor signal with a lab scope. If the camshaft position is confirmed out of sync with the crankshaft, a stretched or jumped timing chain may be the real issue — that is a much more serious (and expensive) repair. Don't drive extensively with this code if you also have P0016 or P0017 (cam/crank correlation codes). Expect $100-$250 for sensor replacement.

Frequently Asked Questions

What does the camshaft position sensor actually do?

The camshaft rotates at half the speed of the crankshaft and controls when the intake and exhaust valves open and close. The camshaft position sensor monitors this rotation and tells the ECM which cylinder is coming up on its compression stroke. The ECM uses this data to sequence the fuel injectors correctly — firing each injector just before its cylinder needs fuel. On engines with variable valve timing (VVT), the ECM also uses this signal to adjust valve timing for better efficiency.

Can P0342 cause a no-start?

Yes — a completely failed camshaft position sensor can prevent the engine from starting on some vehicles. On others, the ECM can make do without the cam signal by using only the crankshaft signal. However, even when the engine starts, it will likely run poorly and consume extra fuel. The check engine light will be on and the engine may stall.

How do I know if it's the sensor or a timing chain problem?

Check for P0016 or P0017 codes alongside P0342. Those codes specifically indicate that the cam and crank positions are out of sync — a timing chain symptom. Also listen for a rattling noise from the engine at startup — stretched timing chains often rattle briefly when cold. A mechanic can confirm timing chain status with the right diagnostic tools before you spend money on a sensor.