2023 Rivian R1S

Rivian R1S P0D3A DC Fast Charge Fault — Proximity Pilot Voltage Out of Range

P0D3A RIV_CHG_0x2C Published 2025-01-20 Updated 2025-01-20
Rivian R1S P0D3A DC fast charging CCS proximity pilot charge port

2023 Rivian R1S presented with DC CCS fast charging failure at all stations. AC Level 2 charging worked normally. P0D3A stored. Root cause: proximity pilot resistor inside the CCS charge port had drifted out of specification, causing the vehicle to reject DC charging sessions.

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The Problem
2023 Rivian R1S Max Pack (18,700 miles) unable to initiate DC fast charging at any CCS station. AC Level 2 charging at 11.5kW worked correctly. P0D3A confirmed. Customer tested at 4 different Electrify America stations with same result — session initiates then terminates within 10 seconds.
Diagnostic Procedure
  1. 1. Confirm P0D3A. AC charging path normal — confirms HV battery, contactors, and BMS functional.
  2. 2. CCS DC charging path specific fault. CCS uses a proximity pilot (PP) signal to communicate cable current rating. Measure PP resistance on vehicle side (with EVSE unplugged): reads 820 ohms. CCS specification for the vehicle inlet PP resistor is 150 ohms (±20%).
  3. 3. 820 ohms is far outside spec. This tells the EVSE that no cable is connected (open circuit is >1kΩ), causing immediate session termination.
  4. 4. Inspect CCS charge port inlet. PP resistor is integrated into the CCS port assembly. No external damage to port.
  5. 5. Remove charge port assembly. PP resistor on the board has drifted — common in early Rivian units exposed to repeated thermal cycling (warm climate, frequent DC charging).
  6. 6. Replace CCS charge port assembly. Post-replacement PP resistance: 152 ohms — within spec.
  7. 7. Initiate DC CCS session at Electrify America 350kW station. Session completes normally at 200kW+ peak. P0D3A does not return.
Resolution & Root Cause
CCS charge port assembly replaced. Proximity pilot resistance restored to spec. DC fast charging fully operational.
💡 Key Lesson
Rivian R1S DC charging failure at all CCS stations with AC charging working normally — measure proximity pilot resistance on the vehicle inlet before any further diagnosis. A drifted PP resistor (should be 150 ohms) will cause every EVSE to terminate the DC session immediately. This is a charge port assembly replacement, not a BMS or HV battery issue.
About This Case

This case was solved remotely by an HVDesk specialist with 15+ years of hands-on experience across major EV platforms including Tesla, Hyundai/Kia, Volkswagen ID series, BMW i-series, and Ford EVs. The procedure was provided as structured remote support to an independent auto repair shop.