P228C on GMC
Fuel Pressure Regulator 1 Exceeded Control Limits — Pressure Too Low
P228C on GMC vehicles indicates fuel pressure regulator 1 exceeded control limits — pressure too low. Au7o has documented this code across 1 GMC model — most commonly on Savana. A generic OBD-II powertrain code set when the powertrain control module sees the fuel pressure regulator control circuit driven beyond its specified range while actual fuel rail pressure is still below the commanded target. It shows up on high-pressure fuel systems generally, and is most commonly reported on diesel high-pressure injection systems, though gasoline direct-injection engines set it too. Expect long cranking, rough idle, hesitation, reduced power or limp mode, poor fuel economy, and possible stalling. Some manufacturers assign a slightly different definition, so confirm against the factory service information for your vehicle. Typical repair costs on GMC range from $120 to $3,000, depending on the specific model and root cause.
Common Causes of P228C
- •Failing high-pressure fuel pump (worn pump lobe/follower on direct-injection engines)
- •Faulty fuel pressure regulator or its control solenoid
- •Fuel rail pressure sensor reading inaccurately
- •Low supply pressure from the lift/low-pressure pump or a clogged fuel filter
- •Fuel leak — leaking injector, rail, or high-pressure line
- •Wiring, connector, or ground fault in the regulator control circuit
P228C on GMC by Model
GMC Savana(1 issue)
- 2.8L Duramax LWN Diesel Emissions System Faults - DPF, DEF Heater and Fuel Filter Restriction2017-2019
The four-cylinder 2.8L Duramax (RPO LWN) was offered in the Savana and Express from the 2017 model year and brings a failure set unique to the diesel vans - nothing on the gasoline vans resembles it. Owners report DEF heater failures, incomplete or repeating DPF regeneration, EGR fouling, and premature fuel filter restriction that trips a reduced-engine-power condition with codes such as P026D and P228C. Cold weather makes both the DEF and the regen problems markedly worse. GM also issued emission recall 17337 covering 2017-2018 diesel Express/Savana vans whose ECM might not correctly detect and diagnose a fault in the exhaust particulate matter sensor circuit, an OBD monitoring defect rather than a hardware failure. Separately, the LWN uses a timing belt with a defined service life; skipping it risks catastrophic engine damage.
Looking for P228C on a different make?
View P228C across all makes →Frequently Asked Questions
What does P228C mean on GMC?▼
P228C stands for "Fuel Pressure Regulator 1 Exceeded Control Limits — Pressure Too Low." A generic OBD-II powertrain code set when the powertrain control module sees the fuel pressure regulator control circuit driven beyond its specified range while actual fuel rail pressure is still below the commanded target. It shows up on high-pressure fuel systems generally, and is most commonly reported on diesel high-pressure injection systems, though gasoline direct-injection engines set it too. Expect long cranking, rough idle, hesitation, reduced power or limp mode, poor fuel economy, and possible stalling. Some manufacturers assign a slightly different definition, so confirm against the factory service information for your vehicle. On GMC specifically, this code is documented across 1 model.
What causes P228C on GMC vehicles?▼
Common causes on GMC: Failing high-pressure fuel pump (worn pump lobe/follower on direct-injection engines), Faulty fuel pressure regulator or its control solenoid, Fuel rail pressure sensor reading inaccurately, Low supply pressure from the lift/low-pressure pump or a clogged fuel filter, Fuel leak — leaking injector, rail, or high-pressure line. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P228C on a GMC?▼
Repair costs on GMC range from $120 to $3,000, depending on the specific model and root cause.
Which GMC models have P228C documented?▼
Au7o has documented P228C on 1 GMC model: Savana.