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 noticed a problem with how the engine starts when it's cold. It's like when you try to start a car on a cold morning and it doesn't start smoothly.
The engine's computer monitors the ignition timing during a cold start. If it detects that the timing is not within the expected range for Bank 2, it triggers this code.
P137C indicates that the Powertrain Control Module (PCM) has detected an issue with the ignition timing during a cold start on Bank 2 of the engine. This can affect the engine's performance and emissions.
• Rough cold start
• Poor fuel economy
• Check Engine Light illuminated
• Faulty ignition timing sensor
• Issues with the PCM
• Wiring problems or poor connections
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics II
• Check for any other diagnostic trouble codes.
• Inspect the ignition timing sensor and related wiring.
• Test the PCM for proper operation.
• Replace the ignition timing sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Timing light
$150 - $500
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance checks
• Ensure proper engine tune-ups
• Use high-quality fuel
Engine Performance
• Have your vehicle inspected by a professional if you notice rough starts.
• Do not ignore the Check Engine Light.
Check your vehicle's warranty booklet for coverage on engine components.
This code has been associated with cold climate issues and vehicles with high mileage.
Moderate – It should be addressed soon to avoid long-term engine damage.
Ignoring this code could lead to increased emissions and potential engine damage.
• Cold engine start
• Ambient temperature below 50°F
Bank 2 of the engine, typically on the side with cylinder 2.
Q: What is Bank 2?
A: Bank 2 refers to the side of the engine opposite to where cylinder 1 is located.
Q: Can I drive with this code?
A: It's possible, but it's not recommended as it can lead to further engine issues.
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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.
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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.
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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.
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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.