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 there's a problem with the injector in cylinder 8 of the engine. It's like a squirt gun that isn't working right, so the engine might not run smoothly.
The code P31CE indicates an issue with the electrical circuit that controls the fuel injector for cylinder 8. The circuit is reading a low voltage, which suggests a problem with the injector's ability to receive power.
P31CE is triggered when the Engine Control Module (ECM) detects a low voltage condition in the high side circuit of the high-pressure fuel injector for cylinder 8. This can affect the injector's performance, leading to improper fuel delivery.
• Engine misfire
• Rough idling
• Reduced engine performance
• Faulty injector in cylinder 8
• Wiring issues such as a short or open circuit
• Malfunctioning ECM or injector driver
ECM: Engine Control Module
Injector: A device that sprays fuel into the engine's cylinders
• Check for any other related codes and address them first.
• Inspect the wiring and connectors for cylinder 8 injector.
• Test the injector for proper operation and resistance.
• Repair or replace damaged wiring or connectors.
• Replace the faulty injector.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Injector tester
$200 - $600
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regular maintenance and inspection of fuel system components.
• Ensure proper electrical connections.
• Use quality fuel to prevent injector clogging.
Engine Performance
• Avoid driving with a misfiring engine to prevent further damage.
• Consult a professional mechanic for accurate diagnosis and repair.
Check vehicle warranty for coverage on fuel system components.
This code has been associated with injector issues in V8 engines, particularly in GM vehicles.
Moderate – Address promptly to avoid engine performance issues.
Driving with a misfiring engine can lead to increased emissions and potential safety hazards.
• Engine running
• Warm operating temperature
The injector for cylinder 8 is located on the engine block, typically on the right side of a V8 engine.
Q: Can I drive with a P31CE code?
A: It's not recommended as it can cause engine damage and poor performance.
Q: How can I prevent this code from occurring?
A: Regular maintenance and using quality fuel can help prevent injector issues.
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.
Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
View options on Amazon
Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.