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DTC codes / P2Dxx · Hybrid propulsion / P2D5D

P2D5DBattery Charging System Positive Contactor C Stuck Open

P2D5D indicates that the battery charging system's positive contactor C is stuck in the open position, preventing current from flowing through that circuit. The powertrain control module detects an unexpected lack of voltage or current when the contactor should be closed, typically during charging or high-load conditions.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the battery/charging system warning light or service vehicle soon message
  • Often no symptoms besides the warning light, especially if the contactor is only intermittently stuck
  • Reduced or absent charging, leading to a slowly draining battery and eventual no-start
  • Electrical accessories dimming or malfunctioning under load
  • Voltage gauge reading lower than normal or fluctuating
  • Inability to enter or complete a high-voltage charging session on electrified vehicles

Common causes, most likely first

  1. Contactor coil failure or open circuit in the contactor control wiring
  2. Stuck-open contactor contacts due to wear, arcing, or contamination
  3. Poor electrical connection at the contactor terminals or ground points
  4. Faulty battery monitoring sensor providing incorrect current feedback
  5. Powertrain control module software error or internal driver fault
  6. Damaged wiring harness between the contactor and the control module

How to diagnose and fix it

  1. Connect a scan tool and record all stored codes and freeze-frame data to confirm P2D5D is current
  2. Inspect the contactor, its connectors, and related wiring for corrosion, looseness, or damage
  3. Measure resistance across the contactor coil and compare to specification
  4. Check for voltage and ground signals at the contactor control circuit during a commanded close
  5. Test the contactor's power contacts for continuity when commanded closed
  6. Repair or replace faulty wiring, connectors, or the contactor as needed
  7. Clear codes and perform a charging system test to verify the repair

What a stuck-open contactor really means

  • A stuck-open contactor can mimic a failed alternator or battery, so always verify control signals before replacing major components.
  • Intermittent faults often occur only under specific temperature or vibration conditions, making a wiggle test of the harness essential.
  • Some vehicles use the contactor for both charging and load shedding, so the code may set without any charging complaint.
  • A weak or failing 12-volt battery can cause spurious contactor codes by dropping voltage during module initialization.
  • After replacement, some contactors require a learn or adaptation procedure with a scan tool to avoid recurring codes.

Can I keep driving with P2D5D?

If the warning light is on and charging voltage is normal, you may drive short distances to a repair shop, but avoid long trips or heavy electrical loads. If the battery is not charging, do not drive far; the vehicle may stall or fail to restart.

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 all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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