Faulty ignition coil 3, where the internal feedback circuit has failed even though the coil may still spark; Damaged or corroded wiring or connector at ignition coil 3, including a backed-out terminal or broken lock tab; Open or shorted feedback circuit between coil 3 and the PCM, often from chafed harness insulation or a pinched wire; Failed PCM driver or feedback input for coil 3, which is less common but possible after a voltage spike or water intrusion; Poor ground connection for the coil circuit, causing the feedback signal to float outside the expected range; Aftermarket or incorrect coil installed previously that does not provide the correct feedback signal to the PCM

DTC codes / GM codes / P1310

P1310 · GMIgnition Coil 3 Primary Feedback Circuit

Q: What does code P1310 mean?

Ignition Coil 3 Primary Feedback Circuit. P1310 on a GM vehicle means the powertrain control module (PCM) is not receiving the expected primary feedback signal from ignition coil 3, so it cannot confirm that coil is firing correctly. The PCM monitors the coil's primary circuit and sets this code when the feedback voltage stays outside the expected range during engine operation.

P1310 on a GM vehicle means the powertrain control module (PCM) is not receiving the expected primary feedback signal from ignition coil 3, so it cannot confirm that coil is firing correctly. The PCM monitors the coil's primary circuit and sets this code when the feedback voltage stays outside the expected range during engine operation.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Check engine light or service engine soon light illuminated, often with no other symptoms
Rough idle or misfire felt as a shake or stumble, especially noticeable at idle or light throttle
Loss of power or hesitation during acceleration because one cylinder is not contributing fully
Increased fuel consumption as the PCM adjusts fuel delivery to compensate for the misfire
A flashing check engine light in severe cases, indicating a misfire that can damage the catalytic converter
Often no symptoms besides the warning light when the feedback circuit fails but the coil still fires normally

Common causes, most likely first

Faulty ignition coil 3, where the internal feedback circuit has failed even though the coil may still spark
Damaged or corroded wiring or connector at ignition coil 3, including a backed-out terminal or broken lock tab
Open or shorted feedback circuit between coil 3 and the PCM, often from chafed harness insulation or a pinched wire
Failed PCM driver or feedback input for coil 3, which is less common but possible after a voltage spike or water intrusion
Poor ground connection for the coil circuit, causing the feedback signal to float outside the expected range
Aftermarket or incorrect coil installed previously that does not provide the correct feedback signal to the PCM

How to diagnose and fix it

Inspect ignition coil 3 and its connector for corrosion, loose terminals, or a cracked coil housing, and reseat the connector firmly
Check the coil 3 feedback circuit for continuity and short-to-ground or short-to-power using a wiring diagram and a digital multimeter
Swap ignition coil 3 with a known-good coil from another cylinder and see whether the code follows the coil or stays with cylinder 3
Verify the ground and power feeds at the coil 3 connector with the key on and during cranking, comparing to a known-good cylinder
If the circuit and coil test good, check the PCM connector for corrosion or pushed pins on the coil 3 feedback terminal
Replace ignition coil 3 only after confirming the feedback circuit is intact and the fault follows the coil during a swap
Clear the code and perform a drive cycle that includes idle and light-load operation to confirm the repair

Why coil 3 feedback fails without a misfire

A coil can still produce a strong spark while its primary feedback circuit is dead, so the engine may run perfectly and the only clue is the stored code.
Technicians often replace the coil first and find the code returns because the real problem is a chafed feedback wire in the harness near the coil bracket.
A weak or failing ignition coil on another cylinder can sometimes set a feedback code for cylinder 3 if the PCM misinterprets shared circuit noise, so check all coils before condemning the PCM.
Water intrusion into the coil connector or PCM connector after engine washing or a coolant leak is a common hidden cause of feedback circuit codes on GM engines.
This code does not always mean the coil is misfiring; it means the PCM cannot verify coil 3 operation, so diagnose the feedback circuit before condemning the coil.

Can I keep driving with P1310?

You can usually drive short distances at moderate speed with P1310 stored, but avoid heavy acceleration and towing until the fault is repaired because a persistent misfire can overheat the catalytic converter. If the check engine light is flashing, stop driving and have the vehicle towed or repaired immediately.

Tools that help

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Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.