P216C — Fuel Injector Group "E" Supply Voltage Circuit High

How do I diagnose P216C myself?

Start with a scan: confirm P216C, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the fuel injector group "E" supply voltage, and verify the suspect component against live data before buying parts.

Will P216C clear itself?

Sometimes P216C clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How much does it cost to fix P216C?

Replace the fuel pump — $400–$900; Replace the pressure regulator or sensor — $150–$450; Replace the fuel filter — $80–$200; Clean or replace injectors — $200–$800. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

Is it safe to drive with P216C?

Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.

What is the most common cause of P216C?

The most common causes are: vacuum or intake leaks skewing the mixture, faulty fuel pressure regulator, contaminated or incorrect fuel.

What does P216C mean?

When P216C appears on a scan, it means the control module has flagged a problem in the fuel delivery and mixture control: fuel injector group "E" supply voltage circuit high. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.

“Circuit high” means the control module sees a voltage on the fuel injector group "E" supply voltage circuit that is above the expected range — typically close to battery voltage. Physically this points to a short to a power feed, a broken ground return, or a failed component pulling the signal line high.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P216C and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.

What causes P216C?

• signal wire shorted to battery positive
• failed fuel injector group "E" supply voltage pulling the signal high
• open ground return of the fuel injector group "E" supply voltage
• faulty fuel pressure regulator
• clogged or leaking fuel injectors
• vacuum or intake leaks skewing the mixture
• weak fuel pump or clogged fuel filter

Common symptoms of P216C

• fuel smell in severe cases
• loss of power under load
• rough idle and hesitation
• increased fuel consumption
• hard starting or long cranking
• Check Engine Light on

How to diagnose P216C

1. Connect an OBD2 scanner, confirm P216C is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
3. Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
4. With the fuel injector group "E" supply voltage disconnected, measure signal voltage at the harness connector: a high reading with the component unplugged indicates a short to power in the harness; if it drops to normal, the component itself is faulty.
5. Measure fuel pressure at the rail and compare with factory specification at idle and under load.
6. Check short-term and long-term fuel trims in live data to see which way the mixture is off.
7. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P216C does not return.

How to fix P216C

Start with the cheapest and most common causes before replacing expensive parts:

• Replace the fuel pump — $400–$900
• Replace the pressure regulator or sensor — $150–$450
• Replace the fuel filter — $80–$200
• Clean or replace injectors — $200–$800

How much does it cost to fix P216C?

Repair cost depends on which component actually failed. Typical scenarios for P216C (parts and labor, USD, independent shop rates):

• Replace the fuel pump: $400–$900
• Replace the pressure regulator or sensor: $150–$450
• Replace the fuel filter: $80–$200
• Clean or replace injectors: $200–$800

Overall, fixing P216C usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P216C?

Drive with caution. Mixture and fuel-pressure faults can cause stalling, hesitation in traffic and — when severe — catalyst damage. Avoid long trips until diagnosed.

Related OBD2 codes

• P2100: Throttle Actuator "A" Control Motor Circuit/Open
• P2101: Throttle Actuator "A" Control Motor Circuit Range/Performance
• P2102: Throttle Actuator "A" Control Motor Circuit Low
• P2103: Throttle Actuator "A" Control Motor Circuit High
• P2104: Throttle Actuator Control System - Forced Idle
• P2105: Throttle Actuator Control System - Forced Engine Shutdown