Engine Sensor and Timing Codes

What does P0340 camshaft position sensor A circuit bank 1 mean?

The engine computer is not seeing a valid signal from the bank 1 camshaft position sensor, caused by a failed sensor, wiring or connector problems, or sometimes a timing or reluctor issue.

What does P0010 camshaft position actuator circuit bank 1 mean?

Short answer: The engine computer found an electrical problem in the bank 1 intake camshaft actuator circuit, usually the oil control solenoid, its wiring or connector, or the computer's driver.

Variable valve timing systems use an oil control solenoid to direct oil pressure to the cam phaser. P0010 is an electrical code: the computer sees a circuit problem rather than a timing error.

Check the solenoid connector for oil contamination, corrosion or broken locks. Measure solenoid resistance and compare it with specifications. Check for shorts to ground or power and verify that the computer supplies the command. A scope shows the duty-cycle command and current flow when the solenoid operates.

Many scan tools can command the solenoid on and off; listen for clicking or watch for a change in engine idle. If the circuit is good and the code returns, the solenoid may have an internal fault. Make sure the engine oil is the correct viscosity and level, as VVT systems are sensitive to oil. Avoid hot engine components when working near the solenoid.

What does P0118 engine coolant temperature sensor circuit high mean?

Short answer: The coolant temperature sensor signal voltage is high, which the engine computer reads as very cold coolant; this usually means an open circuit, a disconnected sensor or a failed sensor.

Coolant temperature sensors are usually thermistors whose resistance drops as temperature rises. The computer reads voltage across the sensor, and an open circuit pushes voltage high, which appears as extremely cold coolant. The cooling fans may run constantly as a failsafe, and fuel delivery may be richer than needed.

Check the scan tool reading. A value stuck at a very low temperature with a warm engine points to an open. Unplug the sensor, inspect the connector and check reference voltage and ground. Measure sensor resistance and compare it with the chart in service information.

A quick test is to jumper the signal to ground with a fused jumper: the reading should go to a very high temperature, confirming the wiring and computer input. Allow the engine to cool before removing the sensor, because a hot cooling system is under pressure and can spray scalding coolant.

What does P0520 engine oil pressure sensor circuit mean?

Short answer: The engine computer found an electrical problem with the oil pressure sensor or switch circuit; it does not by itself prove low oil pressure, but oil pressure should be verified with a mechanical gauge.

Oil pressure sensors and switches tell the computer or cluster about oil pressure. P0520 indicates the circuit is out of range, such as an open, short or invalid signal.

Never assume the code is only electrical. Check oil level first, then verify actual oil pressure with a mechanical gauge installed in place of the sensor. If mechanical pressure is normal, focus on the sensor, connector and wiring. Oil leaks at the sensor can contaminate the connector.

If actual oil pressure is low, stop driving the engine and diagnose the cause, such as low oil, wrong viscosity, a worn pump or bearing wear. Running an engine with low oil pressure can destroy it quickly. Keep clear of moving parts when the engine is running with test equipment connected, and wear eye protection when connecting gauges.

What does P0013 exhaust camshaft position actuator circuit mean?

Short answer: P0013 indicates an electrical problem in the bank 1 exhaust camshaft actuator circuit, usually the exhaust oil control solenoid, its wiring or connector, or the computer driver.

On engines with variable exhaust cam timing, P0013 is the exhaust-side companion to the intake actuator circuit code. It points to the electrical circuit rather than a mechanical timing error, although wiring, solenoids and mechanical faults can all show up together.

Check the connector for oil wicking and corrosion, measure the solenoid resistance and verify the computer's command. Use a scan tool to command the solenoid if supported. A scope or current probe can show whether current flow looks normal.

If the circuit tests good, check the solenoid screen or filter if the design has one, since debris can affect performance, and confirm oil level and specification. Correlation codes alongside P0013 may point to timing chain stretch or phaser problems. Allow the engine to cool before removing solenoids, and catch oil that drains out.

What does P0597 thermostat heater control circuit open mean?

Some engines use an electrically heated thermostat to adjust operating temperature, and P0597 means the computer found an open circuit in the heater, its wiring or connector.

What does P0480 cooling fan relay 1 control circuit mean?

The engine computer found a problem in the circuit that controls cooling fan relay 1, such as an open, short or failed relay, which can lead to overheating or a fan that runs constantly.

What does P0217 engine coolant over temperature condition mean?

Short answer: P0217 means the engine module detected coolant temperature above a safe limit; stop driving, let the engine cool and check coolant level, fans, thermostat and the sensor reading.

P0217 sets when the coolant temperature sensor reports a temperature above the maker's limit. Some vehicles reduce engine power to protect the engine.

Causes include low coolant, a failed cooling fan, a stuck thermostat, a failed water pump, a clogged radiator or a head gasket problem. A faulty sensor or wiring can also cause a false reading.

Let the engine cool before opening the cooling system to avoid burns. Check coolant level, fan operation and live data. Pressure test the system and test for combustion leaks if needed. Compare sensor readings with an infrared thermometer.

What does P0453 EVAP pressure sensor high input mean?

Short answer: P0453 means the EVAP system pressure sensor signal is higher than expected, often from a wiring fault, a failed sensor or a blocked vent; check the sensor circuit before replacing parts.

The EVAP pressure sensor, usually on or near the fuel tank or canister, reports pressure or vacuum in the fuel vapor system so the engine module can run leak tests. P0453 sets when the signal stays above its normal range.

Common causes include an open sensor ground or signal wire shorted to voltage, a damaged connector, a failed sensor, or a real high-pressure condition from a stuck vent valve or blocked vent line. Some vehicles also have fuel tank pressure readings in live data that help separate a real pressure problem from a circuit problem.

Check the reading with the fuel cap removed, which should be near zero. Test reference, ground and signal at the connector. Fuel vapor is flammable, so keep sparks and flames away and work in a ventilated area.

What does P0316 misfire detected on startup mean?

Short answer: P0316 means misfires were detected during the first 1000 revolutions after the engine started; causes include ignition, fuel or mechanical problems, often worse when cold.

Some engines monitor misfires right after startup, when cold conditions make misfires more likely. P0316 sets when misfires occur during this period.

Common causes include worn spark plugs, ignition coils, leaking injectors, low fuel pressure, carbon buildup or mechanical problems. Cold weather can make the condition worse.

Look for other misfire codes, check freeze frame data, and test ignition and fuel components. Check fuel pressure and look for leaking injectors. Keep hands clear of moving parts with the engine running, and relieve fuel pressure before opening fuel lines.