Fuel Injector Group Supply Voltage Low
The P216B code indicates that the powertrain control module (PCM) has detected a low voltage condition in the supply circuit for a group of fuel injectors. This can be caused by a faulty injector driver, damaged wiring or connectors, a weak battery or alternator, or a failing PCM. The low voltage prevents the injectors from opening properly, leading to poor engine performance.
01. Most Common Causes
- Faulty fuel injector driver circuit
- Damaged wiring or connectors in the injector supply circuit
- Weak battery or failing alternator
- Corroded or loose ground connections
- Faulty PCM
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Reduced engine power and acceleration
- Check Engine Light illuminated
- Poor fuel economy
- Hard starting or no start
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Inspect the wiring and connectors for the fuel injector group for damage, corrosion, or loose connections.
Step 3: Test the battery voltage and alternator output to ensure proper charging system operation.
Step 4: Check the fuel injector driver circuit using a multimeter or oscilloscope to verify voltage supply.
Step 5: If all else is normal, test the PCM for proper operation or perform a relearn procedure.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause engine misfires, poor performance, and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost to fix P216B typically ranges from $50 to $150 for diagnostic and minor repairs like wiring fixes, but could be higher if the PCM needs replacement.