P0D59 on Cadillac: How to Diagnose & Fix
Proximity Detection Circuit "A" High
1 Cadillac model · 1 documented issue · 1 critical
P0D59 on Cadillac by model: symptoms, diagnosis and fix
GM PIC6015A and PIC6076 cover ELR no-charge conditions and the Service High Voltage Charging System message. A cord, charging station, pilot-signal fault, cracked or water-affected receptacle, or an applicable HPCM2 calibration can produce the concern; the bulletins do not establish universal onboard-charger failure.
Common Symptoms
- Vehicle will not charge
- Service High Voltage Charging System message
How to Fix
Have a qualified technician record DTCs and freeze-frame data, rule out the cord and charging infrastructure, inspect the charge receptacle for cracks or water intrusion, and apply the current GM diagnostic or HPCM2 programming path when its criteria are met. Do not order charging hardware until the cause is confirmed.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (2)
P0D59 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0D59 mean on a Cadillac?
P0D59 stands for "Proximity Detection Circuit "A" High." An EV/plug-in-hybrid charging code documented in Mitsubishi PHEV service information and widely reported on GM plug-ins (Chevrolet Volt). The "proximity detection" circuit is the SAE J1772 proximity pilot signal that tells the vehicle a charge cable is physically latched into the charge port; the charging/on-board charger control module sets this code when it sees abnormally high voltage on that circuit. The monitor generally runs when the vehicle is NOT plugged in and charging. In practice the vehicle may refuse to start a charge session, may not recognize or release the connector, or may display a charging fault message. It does not affect driving on the existing state of charge, but it can leave you unable to recharge. Reported real-world fixes most often involve the charge port inlet connector. On Cadillac it is documented across 1 model: ELR.
What are the most common causes of P0D59?
The most common causes of P0D59 are: Dirty, corroded, or damaged charge port (inlet) contacts, Faulty proximity/latch switch in the charge port inlet assembly, Damaged or worn EVSE charging cable connector, Open or high-resistance wiring between the charge port and the charging control module, Poor ground or spread connector terminals at the charger module, Failed on-board charger / charge control module. The specific cause varies by vehicle.
How much does it cost to fix P0D59 on a Cadillac?
Repair costs vary widely with the root cause and Cadillac model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.