P0517 — Battery Temperature Sensor Circuit High #

Note: The label for code P0517 may vary depending on the vehicle manufacturer.

• Battery Temperature Sensor Circuit High Input (Generic, GM, Ford)
• Battery Temperature Sensor Signal Too High (Chrysler, Jeep, Dodge)
• Battery Temperature Sensor Circuit Voltage High (Hyundai, Kia)

Code summary for P0517 #

P0517 indicates that the Powertrain Control Module (PCM) or Engine Control Module (ECM) has detected a voltage signal from the Battery Temperature Sensor that is higher than the expected range. The battery temperature sensor is a device, usually integrated into or near the battery, that measures battery temperature and sends this information to the PCM. This data helps the vehicle regulate charging rates and protect the battery from damage due to overheating or overcharging. When the voltage reading is too high, the module may interpret this as a circuit fault, potentially disabling charging system adjustments. This code does not necessarily mean the battery itself is overheating, but rather that the sensor circuit is reporting an abnormally high signal.

Common symptoms for code P0517 #

When the P0517 code is triggered, you may notice a range of symptoms, though some vehicles may show few or no obvious issues. The most frequent signs are related to charging system performance and warning lights. Here’s what to look for:

• Illuminated Check Engine Light (CEL)
• Battery or charging system warning light on the dashboard
• Erratic charging behavior (overcharging or undercharging)
• Hard starting or delayed engine cranking, especially in extreme temperatures
• Reduced battery lifespan if the problem is ignored

Probable causes for code P0517 #

Most cases of P0517 are due to electrical issues within the battery temperature sensor circuit. These can range from actual sensor failure to wiring and connection problems. Below are the most likely causes, ranked by frequency:

1. Faulty battery temperature sensor (open or shorted internally)
2. Damaged wiring or connector (corroded, frayed, loose, or shorted to power/ground)
3. Poor battery terminal connection (often due to corrosion or looseness)
4. Defective PCM/ECM (rare, but possible after ruling out other causes)

Step-by-step diagnostic for P0517 #

Proper diagnosis of P0517 requires a logical, methodical approach to avoid unnecessary parts replacement. Here’s a step-by-step guide:

1. Read the code(s) with a compatible OBD-II scanner and note any related codes.
2. Visually inspect the battery temperature sensor and its wiring for signs of damage, corrosion, or disconnection.
3. Check battery terminals and cables for tightness and cleanliness.
4. Test sensor resistance with a multimeter, comparing readings to OEM specifications (typically provided in the service manual).
5. Backprobe the sensor circuit to verify voltage with the ignition on; abnormal readings can indicate a short or open circuit.
6. Repair or replace any damaged wiring or connectors found during inspection.
7. Replace the sensor if resistance or voltage readings are out of spec.
8. Clear the code and test drive the vehicle to confirm repair.
9. If the code returns, further test for PCM/ECM faults (rare).

Possible repairs for P0517 #

The correct repair depends on the root cause. Address the most common and simplest issues first before considering more complex solutions. Possible repairs include:

• Replacing the battery temperature sensor if faulty or out of specification
• Repairing or replacing damaged wiring or corroded connectors in the sensor circuit
• Cleaning and securing battery terminals to ensure a proper electrical connection
• PCM/ECM replacement or reprogramming (only after confirming all other components are functional)

Is it safe to drive with code P0517? #

Limited: You can usually drive with code P0517 present, but it’s not recommended to ignore it. The main risk is improper battery charging, which can cause the battery to overheat, undercharge, or age prematurely. In the worst case, this could leave you stranded or, in rare situations, cause battery damage. Address the issue as soon as possible, especially if your battery warning light is on or you notice starting issues.

Vehicles most commonly affected by P0517 #

While P0517 is a generic OBD-II code and can appear on almost any modern vehicle, it tends to be seen more frequently on certain makes and models due to the design of their battery temperature monitoring systems. Vehicles where this code is most often reported include:

• Chrysler, Dodge, Jeep (especially late 2000s–2010s models)
• Hyundai and Kia (several models from the 2010s)
• GM vehicles (Chevrolet, GMC, Buick, Cadillac)
• Ford and Lincoln (various models)

Common mistakes & best practices for P0517 #

It’s easy to misdiagnose this code, especially if you skip steps or overlook basic checks. Here are some common errors and good habits to follow:

• Replacing the battery or PCM/ECM prematurely without proper testing
• Ignoring wiring and connector issues — the most frequent culprits
• Assuming the sensor is always at fault (wiring faults are often the real cause)
• Not clearing codes after repairs and failing to confirm a successful fix with a test drive
• Always consult the OEM service manual for correct sensor specs and wire color codes

Quick FAQ for P0517 #

Still have questions? Here are fast answers to common concerns about P0517:

• Q: Will code P0517 drain my battery?
  A: Not directly, but improper charging due to a faulty sensor circuit can reduce battery life over time.
• Q: Can I just disconnect the sensor to clear the code?
  A: No. Disconnecting the sensor will almost always trigger the code again and may cause additional errors. Proper diagnosis and repair are required.