Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with the circuit that helps keep the throttle warm. It's like when your electric blanket doesn't turn on because there's a problem with the plug.
The P167C code is triggered when the Engine Control Module (ECM) detects a low voltage condition in the throttle heating relay circuit.
The throttle heating relay is responsible for ensuring that the throttle body does not freeze in cold conditions. This relay activates a heating element to keep the throttle operational. A low circuit condition indicates insufficient voltage or a break in the circuit, preventing the relay from functioning correctly.
• Check Engine Light illuminated
• Poor throttle response
• Throttle freezing in cold conditions
• Faulty throttle heating relay
• Open or shorted wiring in the throttle heating circuit
• Blown fuse related to the throttle heating system
Throttle: A device controlling the flow of fuel or power to an engine.
Relay: An electrically operated switch used to control a circuit.
• Check for any blown fuses related to the throttle heating circuit.
• Inspect the wiring and connectors for damage or corrosion.
• Test the throttle heating relay for proper operation.
• Replace the faulty throttle heating relay.
• Repair or replace damaged wiring or connectors.
• Replace any blown fuses.
• Multimeter
• Relay tester
• Basic hand tools
$100 - $300
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regularly inspect electrical connections for corrosion.
• Ensure fuses are in good condition.
• Perform routine maintenance checks.
Sensor Issue
• Have a professional diagnose the issue to avoid further damage.
• Do not ignore the Check Engine Light.
Check with your vehicle manufacturer for specific warranty coverage related to electrical components.
This code has been more commonly reported in vehicles operating in colder climates due to the increased demand on the throttle heating system.
Moderate – While the vehicle may still be drivable, it's important to address this issue to prevent throttle freezing in cold conditions.
Driving with a malfunctioning throttle heating system in cold conditions can lead to throttle freezing, which is a safety risk.
• Ensure the vehicle is in a cold environment to test the throttle heating system.
• Check the circuit with the engine off and the ignition on.
The throttle heating relay is typically located in the engine compartment fuse box or relay panel.
Q: Can I drive with a P167C code?
A: While you can drive, it's not recommended in cold conditions as the throttle may freeze.
Q: How do I know if my throttle heating relay is bad?
A: A multimeter can be used to test the relay for continuity and proper operation.
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.