P216B — Fuel Injector Group "E" Supply Voltage Circuit Low

P216B — Fuel Injector Group "E" Supply Voltage Circuit Low. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel pressure regulator, contaminated or incorrect fuel, faulty fuel rail pressure sensor or wiring.

powertrain (engine/transmission)

Is it safe to drive?

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

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P216B is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs 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. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the fuel delivery and mixture control for damage, corrosion, chafing or poor contact.
  4. Subsystem check Check for supply voltage at the fuel injector group "E" supply voltage connector first; then measure resistance from the signal wire to ground — near-zero ohms confirms a short to ground in the harness.
  5. Subsystem check Measure fuel pressure at the rail and compare with factory specification at idle and under load.
  6. Subsystem check Check short-term and long-term fuel trims in live data to see which way the mixture is off.
  7. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P216B does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P216B (parts and labor, USD, independent shop rates): Clean or replace injectors: $200–$800; Replace the pressure regulator or sensor: $150–$450; Replace the fuel pump: $400–$900; Replace the fuel filter: $80–$200. Overall, fixing P216B 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.

Common questions

How do I diagnose P216B myself?

Start with a scan: confirm P216B, 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.

What is the most common cause of P216B?

The most common causes are: faulty fuel pressure regulator, contaminated or incorrect fuel, faulty fuel rail pressure sensor or wiring.

What does OBD2 code P216B mean?

P216B — Fuel Injector Group "E" Supply Voltage Circuit Low. A fault in the fuel delivery and mixture control. Short, gentle driving to a shop is usually possible. Typical causes: faulty fuel pressure regulator, contaminated or incorrect fuel, faulty fuel rail pressure sensor or wiring.

What are the symptoms of P216B?

Drivers most often notice: rough idle and hesitation, fuel smell in severe cases, hard starting or long cranking, loss of power under load.

How much does it cost to fix P216B?

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

What does P216B mean?

When P216B 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 low. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.

“Circuit low” means the voltage on the fuel injector group "E" supply voltage circuit stays below the expected minimum — close to ground. The usual physical reasons are a short to ground, a chafed wire touching metal, a missing supply voltage, or a failed component dragging the signal down.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P216B 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.

Common symptoms of P216B

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

What causes P216B?

  • missing supply voltage to the fuel injector group "E" supply voltage
  • signal wire shorted to ground (chafed insulation)
  • failed fuel injector group "E" supply voltage pulling the signal low
  • contaminated or incorrect fuel
  • faulty fuel rail pressure sensor or wiring
  • faulty fuel pressure regulator
  • vacuum or intake leaks skewing the mixture

How to diagnose P216B

  1. Connect an OBD2 scanner, confirm P216B 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. Check for supply voltage at the fuel injector group "E" supply voltage connector first; then measure resistance from the signal wire to ground — near-zero ohms confirms a short to ground in the harness.
  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 P216B does not return.

How to fix P216B

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

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

How much does it cost to fix P216B?

Repair cost depends on which component actually failed. Typical scenarios for P216B (parts and labor, USD, independent shop rates):

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

Overall, fixing P216B 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 P216B?

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

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