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DTC codes / Chrysler codes / P1274

P1274 · ChryslerInjectors Wired Incorrectly

P1274 on Chrysler vehicles means the powertrain control module (PCM) has detected that the fuel injector circuits are not wired in the correct firing order or that the injector harness connectors have been swapped. The PCM compares injector circuit behavior during cranking and running to a known good pattern and flags this code when the electrical sequence does not match the engine's firing order.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Often no symptoms besides the warning light if the swap is minor or the engine compensates
  • Rough idle or misfire that may feel like a constant shake
  • Hard starting or extended cranking before the engine catches
  • Poor fuel economy and a rich-running smell from the exhaust
  • Loss of power or hesitation during acceleration
  • Possible multiple misfire codes stored alongside P1274

Common causes, most likely first

  1. Injector harness connectors swapped between cylinders during recent repairs
  2. Injector wiring repaired with incorrect pinout or crossed wires
  3. Faulty or damaged injector harness connector causing intermittent cross-talk
  4. Aftermarket or remanufactured PCM with incorrect injector driver configuration
  5. Corroded or pushed-back terminals in the injector harness causing wrong circuit identification
  6. Engine replacement or rebuild where the injector harness was not routed correctly

How to diagnose and fix it

  1. Verify the injector harness connectors are plugged into the correct cylinders using the factory wiring diagram
  2. Inspect the injector harness for chafing, corrosion, or pushed terminals at each connector
  3. Perform a cylinder balance test or injector kill test to confirm which cylinders are affected
  4. Check for stored misfire codes and freeze-frame data to see if the fault is consistent or intermittent
  5. Compare injector circuit resistance and pulse width with a scan tool to identify swapped circuits
  6. Repair or replace the injector harness section with correct pinout and routing
  7. Clear codes and perform a relearn or drive cycle to confirm the repair

When the harness looks right but the code returns

  • A swapped injector connector at just one cylinder can set P1274 without any driveability complaint, so always verify connector placement before replacing parts.
  • Aftermarket PCMs or performance tunes sometimes mislabel injector drivers, causing P1274 even when the factory harness is untouched.
  • Corrosion inside a single injector connector can make the PCM see the wrong circuit identity, mimicking a wiring swap without any wires being crossed.
  • This code is often stored alongside misfire codes for specific cylinders, which can mislead a technician into replacing coils or plugs instead of checking injector wiring.
  • On some Chrysler engines, the injector harness is part of the main engine harness, so a repair at one connector can accidentally swap pins at another if not traced carefully.

Can I keep driving with P1274?

You can drive the vehicle short distances to a repair shop, but avoid heavy acceleration or towing because the engine may run rich and misfire, which can damage the catalytic converter over time. If the engine runs very rough or stalls, stop driving and have it towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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