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Home/DTC Codes/Ford/Explorer/2002-2005 4.6L V8/P1309
P1309

Misfire Detection Monitor Disabled

2002-2005 Ford Explorer 4.6L V8 🇨🇦

Moderate SeverityPowertrain

Description

The PCM misfire detection monitor is disabled or not functioning. The camshaft position sensor synchronizer may not be providing the correct signal needed for accurate misfire detection. Common on Ford 3.0L, 3.8L, and 4.2L engines.

Symptoms

  • Check Engine Light
  • Possible rough running
  • Other misfire codes may not set properly
  • Failed emissions test

Common Causes

  • Incorrectly installed camshaft position sensor synchronizer
  • Faulty camshaft position sensor
  • Damaged CMP sensor wiring
  • CMP sensor synchronizer gear misaligned

Diagnostic Steps

  1. Check camshaft position sensor signal on scan tool
  2. Verify CMP synchronizer is correctly installed and aligned
  3. Test CMP sensor resistance and signal
  4. Inspect CMP wiring and connector

Repair Notes

Verify CMP synchronizer alignment. Replace CMP sensor if signal is weak or absent.

Related Codes

P0340Camshaft Position Sensor A Circuit Bank 1P1336Crankshaft/Camshaft Sensor Range/PerformanceP1336Crankshaft/Camshaft Sensor Range/PerformanceP1336Crankshaft/Camshaft Sensor Range/PerformanceP1336Crankshaft Position System Variation Not LearnedP1336Crankshaft Position System Variation Not LearnedP1336Crankshaft Position System Variation Not LearnedP1336Crankshaft Position System Variation Not LearnedP1336Crankshaft Position System Variation Not LearnedP1336Crankshaft Position System Variation Not LearnedP1336Crankshaft Position System Variation Not LearnedP1336Crankshaft Position System Variation Not LearnedP1336Crankshaft Position Sensor Range/PerformanceP1336Crankshaft Position Sensor Range/PerformanceP1336Crankshaft Position Sensor CKPP1336Crankshaft Position Sensor CKP

Other Powertrain Codes

P1309 on Other Vehicles

Ford Aerostar

1990-1997 3.0L V6

Ford Aerostar

1990-1997 4.0L V6

Ford Bronco

1990-1996 4.9L I6 300

Ford Bronco

1990-1996 5.0L V8 302 Windsor

Ford Bronco

1990-1996 5.8L V8 351 Windsor

Ford Bronco

2021-2024 2.3L I4 EcoBoost

Ford Bronco

2021-2024 2.7L V6 EcoBoost

Ford Bronco Raptor

2022-2024 3.0L V6 EcoBoost

Common Questions

What does code P1309 mean on a 2002-2005 Ford Explorer?

P1309 stands for "Misfire Detection Monitor Disabled". The PCM misfire detection monitor is disabled or not functioning. The camshaft position sensor synchronizer may not be providing the correct signal needed for accurate misfire detection. Common on Ford 3.0L, 3.8L, and 4.2L engines.

What are the symptoms of P1309 on a Ford Explorer?

Common symptoms of P1309 include: Check Engine Light, Possible rough running, Other misfire codes may not set properly, Failed emissions test.

What causes P1309 on a 2002-2005 Ford Explorer?

Common causes of P1309 include: Incorrectly installed camshaft position sensor synchronizer, Faulty camshaft position sensor, Damaged CMP sensor wiring, CMP sensor synchronizer gear misaligned.

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