Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a part in the car's engine that helps control the timing of the engine's camshaft. It's like a switch that isn't working properly.
The P104C code indicates an issue with the electrical circuit controlling the camshaft timing pressure accumulator shutoff valve. This can affect the engine's performance.
The camshaft position timing pressure accumulator shutoff valve is part of the variable valve timing system. It controls oil pressure to adjust the timing of the camshaft. An open circuit or fault in the control circuit can lead to improper camshaft timing, affecting engine efficiency and performance.
• Check Engine Light is on
• Poor engine performance
• Reduced fuel efficiency
• Faulty camshaft timing pressure accumulator shutoff valve
• Open or shorted wiring in the control circuit
• Faulty engine control module (ECM)
Camshaft: A shaft in the engine that controls the opening and closing of the engine's valves.
ECM: Engine Control Module, the computer that controls the engine's functions.
• Use an OBD-II scanner to confirm the P104C code.
• Inspect the wiring and connectors related to the valve for damage or corrosion.
• Test the camshaft timing pressure accumulator shutoff valve for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty camshaft timing pressure accumulator shutoff valve.
• Reprogram or replace the engine control module if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $500
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance checks on the engine's electrical systems.
• Ensure proper oil levels and quality.
• Inspect wiring and connectors for wear during routine services.
Sensor Issue
• Have the vehicle inspected by a professional mechanic.
• Avoid driving the vehicle aggressively until the issue is resolved.
Check with the vehicle manufacturer for specific warranty coverage on engine components.
This code has been associated with vehicles that have advanced variable valve timing systems.
Moderate – It should be addressed soon to avoid potential engine performance issues.
Driving with an unresolved P104C code may lead to reduced engine performance and increased emissions.
• Engine at operating temperature
• Vehicle stationary with engine idling
The camshaft timing pressure accumulator shutoff valve is typically located near the engine's camshaft or within the valve cover.
Q: Can I drive my car with a P104C code?
A: It's not recommended to drive for extended periods with this code, as it can affect engine performance.
Q: How can I prevent a P104C code?
A: Regular maintenance and inspections of the engine's electrical components can help prevent this issue.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.