What Does P0345 Mean?
The ECM has detected a general malfunction in the camshaft position sensor A circuit on Bank 2 (the cylinder bank that does not contain cylinder #1). This means the ECM is receiving no signal or an invalid signal from the Bank 2 CMP sensor. On V-configuration engines, this affects timing control for the second bank and can cause the engine to run rough, fail to start, or default to a fixed timing map with reduced performance.
Common Causes
35%
Failed camshaft position sensor A on Bank 2 with no signal output due to internal Hall-effect element failure
30%
Open or shorted wiring in the CMP sensor circuit between the Bank 2 sensor and ECM, often from heat damage near the exhaust
25%
Corroded, damaged, or disconnected connector at the Bank 2 CMP sensor due to oil leaks from valve cover gasket
10%
Damaged or missing reluctor wheel teeth on the Bank 2 camshaft preventing proper signal generation
Diagnostic Steps
1
Verify the Bank 2 CMP sensor connector is fully seated and locked. Inspect for oil intrusion from valve cover gasket leaks, which is a common cause of connector failure on Bank 2 sensors.
2
With KOEO, verify 5V reference and ground at the CMP sensor connector. If reference voltage is missing, trace the 5V supply circuit back to the ECM checking for opens or shorts to ground.
3
Measure CMP sensor output with an oscilloscope while cranking. A healthy Hall-effect sensor produces clean 0-5V square waves. No signal output with proper reference and ground confirms a failed sensor.
4
Inspect the wiring harness between the Bank 2 CMP sensor and ECM for heat damage, especially where it routes near the exhaust manifold or catalytic converter.
5
If a new sensor does not resolve the code, remove the valve cover and inspect the camshaft reluctor wheel for sheared, cracked, or missing teeth that would prevent proper signal generation.
Estimated Repair Cost
$85 - $400
Parts + labor, varies by vehicle and location
The ECM has detected a general malfunction in the camshaft position sensor A circuit on Bank 2 (the cylinder bank that does not contain cylinder #1). This means the ECM is receiving no signal or an invalid signal from the Bank 2 CMP sensor. On V-configuration engines, this affects timing control for...
The most common cause of P0345 (Camshaft Position Sensor A Circuit Malfunction (Bank 2)) is: Failed camshaft position sensor A on Bank 2 with no signal output due to internal Hall-effect element failure
Typical repair costs for P0345 range from $85 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of the Bank 2 CMP signal degrades engine timing control and can cause stalling or no-start conditions. The vehicle may enter limp mode with significantly reduced power, which could be hazardous when merging or passing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0345 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Timing / Variable Valve Timing
Difficulty
Type
Generic (SAE)
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