What Does P216B Mean?
The PCM has detected abnormally low voltage in the fuel injector group 'E' power supply circuit. This indicates excessive current draw, resistance, or a short to ground condition affecting injector operation.
Safety Warning
Causes engine misfiring, rough running, and reduced power output. Continued operation can damage catalytic converter and create unsafe driving conditions due to performance loss.
Common Causes
35%
Shorted fuel injector coil in group E causing excessive current draw
25%
Wiring harness short to ground in injector group E power circuit
20%
High resistance in power supply circuit (corroded connections, damaged wire)
12%
Failed fuel injector driver relay with excessive resistance or poor contacts
8%
PCM internal driver circuit fault or weak output stage
Diagnostic Steps
1
Step 1: Measure voltage at fuel injector group E power supply with key on and engine running (compare to battery voltage)
2
Step 2: Disconnect injectors in group E one at a time and measure individual injector coil resistance (typically 12-16 ohms)
3
Step 3: Check for voltage drop across power supply circuit from relay/fuse to injector connector under load
4
Step 4: Inspect all connections in group E power circuit for corrosion, loose terminals, or damaged pins
5
Step 5: Monitor current draw on group E circuit with ammeter to identify excessive amperage indicating shorted injector
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage in the fuel injector group 'E' power supply circuit. This indicates excessive current draw, resistance, or a short to ground condition affecting injector operation.
The most common cause of P216B (Fuel Injector Group "E" Supply Voltage Circuit Low) is: Shorted fuel injector coil in group E causing excessive current draw
Typical repair costs for P216B range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Causes engine misfiring, rough running, and reduced power output. Continued operation can damage catalytic converter and create unsafe driving conditions due to performance loss.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P216B to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
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