Code
P1310
HUMMER
P — Powertrain
Ignition Coil 3 Primary Feedback Circuit
AI status
Completed
Completed
100%
Causes
- Open or short in coil #3 primary wiring (open, short to ground, short to battery)
- Poor or corroded connector or pin at the ignition coil or harness
- Failed ignition coil (internal primary winding or internal driver)
- Faulty PCM/ECM coil driver output
- Poor ground or battery supply to coil circuit
- Intermittent wiring damage (chafing, rodent damage, heat)
Symptoms
- Check Engine Light (MIL) illuminated
- Misfire felt at idle or under load (cylinder 3)
- Rough idle, hesitation, reduced power or poor acceleration
- Decreased fuel economy
- Possible no-start condition if coil completely fails
- Intermittent faults that may come and go with vibration or temperature
What to check
- Read freeze frame and live data with a scan tool; note battery voltage and misfire counts for cylinder 3
- Visually inspect coil #3, connector, and wiring for damage, corrosion, or loose pins
- Check battery and charging system voltage (should be ~12.4–14.8 V with engine running)
- Measure coil #3 primary resistance and compare to specification
- Back-probe coil connector while cranking/starting to observe driver signal and supply voltage
- Wiggle test harness/connectors to try to reproduce/clear the fault
Signal parameters
- Primary circuit supply voltage: battery voltage (approx 12–14.8 V with engine running)
- Primary winding resistance (approx; manufacturer-spec required) — typical coil-on-plug primaries ~0.3–2.0 Ω (verify spec for vehicle)
- Secondary winding resistance (approx; verify spec) — often several kΩ depending on coil type
- Driver signal: pulsed ground or switched voltage from PCM; waveform should show consistent pulses when cranking/running
- No continuous short to ground or battery on the primary circuit when coil is inactive
Diagnostic algorithm
- Connect a scan tool and confirm P1310 and any related codes; record freeze-frame data and live parameters (battery voltage, misfire counters).
- Visually inspect coil #3 and wiring harness for damage, corrosion, melted insulation, or loose connectors. Repair any obvious issues.
- Check battery and charging system voltage. Low voltage can cause improper coil operation—restore correct voltage before further testing.
- With ignition off, disconnect coil #3 and measure primary and secondary resistances. Compare to vehicle specifications. Replace coil if out of spec.
- Reconnect coil and back-probe the primary power and driver pins. Crank engine (or use a safe method to observe) and verify supply voltage and driver pulses with a DVOM or oscilloscope.
- Perform a wiggle test on the harness and connector while monitoring for code return or signal loss. Repair or secure wiring as needed.
- Swap coil #3 with a known-good coil from another cylinder (if interchangeable). Clear codes and run engine to see if the P1310 follows the coil (indicates coil fault) or stays on cylinder 3 (indicates wiring/PCM).
- If wiring looks good and coil swap shows fault remains on circuit, perform continuity and short-to-ground/battery checks between coil connector and PCM driver pin. Repair wiring or connector faults.
- If wiring and coil test good but fault persists and PCM driver pin shows abnormal behavior on oscilloscope, consider PCM fault and consult manufacturer service information before replacing PCM (verify grounds, power feeds, and software updates).
- After repairs, clear codes and perform a test drive to confirm the issue is resolved and the code does not return.
Likely causes
- Damaged or corroded coil connector or pin at cylinder 3
- Open/shorted primary winding in coil #3
- Broken or shorted harness between coil and PCM
- Failed coil driver inside PCM (if wiring and coil test OK)
- Low battery voltage or poor ground affecting coil operation
Fault status
Status
Ignition Coil 3 primary feedback circuit malfunction detected (P1310).
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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