P0516 — Battery Temperature Sensor Circuit Low #

The code label for P0516 may vary depending on the vehicle manufacturer.
Known label variations include:

• Battery Temperature Sensor Circuit Low Input (Chrysler, Dodge, Jeep)
• Battery Temperature Sensor Low Circuit (Ford)
• Battery Temperature Sensor Circuit Low Voltage (General Motors)

Code P0516 summary #

P0516 is an OBD-II diagnostic trouble code (DTC) indicating that the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a low voltage condition in the Battery Temperature Sensor Circuit. The battery temperature sensor is a thermistor (a resistor sensitive to temperature) usually located on or near the battery, used to monitor battery temperature for optimal charging and protection. When the sensor circuit reports a voltage that is lower than the expected range, the code is triggered. This code can affect battery charging, especially in cold or hot conditions, and may impact starting reliability or battery life if not addressed promptly.

Frequent symptoms for code P0516 #

A vehicle with a P0516 code may display a range of symptoms, often subtle but potentially worsening over time. Recognizing these signs early can help you avoid battery or charging system damage. Typical symptoms include:

• Battery warning light illuminated on the dashboard
• Difficulty starting, especially in cold or hot conditions
• Unusual charging behavior (overcharging or undercharging)
• Erratic or inaccurate battery temperature readings (if displayed)
• Decreased battery lifespan or repeated battery replacements

Probable causes for code P0516 #

The P0516 code is most frequently triggered by issues within the battery temperature sensor circuit. The root causes, listed from most to least common, are:

1. Faulty battery temperature sensor (thermistor failure)
2. Damaged, shorted, or corroded wiring/connectors in the sensor circuit
3. Poor electrical connection at the battery temperature sensor
4. Open or short circuit in the sensor wiring harness
5. Defective PCM/ECM (rare, but possible if all else checks out)

Step-by-step diagnosis for code P0516 #

Accurate diagnosis is crucial to avoid unnecessary parts replacement and to ensure the battery charging system functions reliably. Here’s a logical diagnostic approach:

• Visually inspect the battery and its immediate area for any damaged, corroded, or loose wiring related to the temperature sensor.
• Check the battery temperature sensor for correct installation and obvious physical damage.
• Use a digital multimeter to measure the sensor circuit’s voltage and resistance values (refer to OEM specifications).
• Disconnect the sensor and check for continuity and shorts to ground in the wiring harness.
• If wiring and sensor check out, inspect the PCM/ECM connectors for corrosion or bent pins.
• Clear the code and perform a test drive to see if the code returns.

Possible repairs for code P0516 #

Resolving a P0516 code usually involves addressing the sensor circuit’s integrity or replacing faulty components. Depending on the specific cause, common repairs include:

• Replacing the battery temperature sensor if it’s faulty or out of OEM-specified range
• Repairing or replacing damaged or corroded wiring/connectors in the sensor circuit
• Securing or cleaning loose or corroded electrical connections at the sensor
• Repairing open or short circuits in the sensor harness
• In rare cases, replacing or reprogramming the PCM/ECM if it has failed internal diagnostics

Is it safe to drive with code P0516? #

Limited: You can usually drive with a P0516 code for a short period, but it is not recommended in extreme temperatures. The battery may not charge correctly, especially in very cold or hot weather, which could eventually leave you stranded with a dead battery. Address the code promptly to avoid unexpected breakdowns or battery damage.

Vehicles most affected by code P0516 #

While P0516 can appear on any OBD-II compliant vehicle with a battery temperature sensor, it’s more commonly reported on certain models, especially those with advanced battery management. These include:

• Chrysler, Dodge, Jeep (2000s–2010s, especially models with battery temperature compensation charging)
• Ford (various models with temperature-compensated charging systems)
• General Motors (Chevrolet Silverado, GMC Sierra, Cadillac Escalade)
• Some Toyota, Honda, and Nissan hybrid models (with battery temp sensors)

Common mistakes & best practices for code P0516 #

Misdiagnosis or overlooking simple issues can lead to unnecessary repairs or repeat failures. Keep these best practices in mind:

• Don’t replace the battery or PCM before thoroughly checking the sensor and wiring.
• Don’t ignore corrosion or loose connections at the sensor or battery terminals.
• Don’t assume the sensor is at fault without measuring its resistance against OEM specs.
• Always clear the code and verify it returns before replacing components.

Quick FAQ for code P0516 #

Got questions? Here are quick answers to common concerns:

• Q: Will P0516 drain my battery?
  A: Not directly, but improper charging due to a faulty sensor could reduce battery life or cause starting issues.
• Q: Can I bypass the battery temperature sensor?
  A: No. The PCM/ECM relies on accurate temperature data to regulate charging safely. Bypassing could damage the battery or electrical system.