P242F on Chevrolet
Diesel Particulate Filter Restriction - Ash Accumulation (Bank 1)
P242F on Chevrolet vehicles indicates diesel particulate filter restriction - ash accumulation (bank 1). Au7o has documented this code across 1 Chevrolet model — most commonly on Cruze. P242F is a generic diesel emissions code indicating the engine control module has detected excessive restriction in the Diesel Particulate Filter (DPF) caused by ash accumulation rather than recoverable soot. Unlike soot, ash cannot be burned off through normal or forced regeneration, so this typically signals the DPF is reaching the end of its service life and needs cleaning or replacement. The condition reduces exhaust flow and can trigger reduced-power (limp) mode if left unaddressed. Typical repair costs on Chevrolet range from $400 to $3,000, depending on the specific model and root cause.
Common Causes of P242F
- •DPF at end of service life with accumulated non-combustible ash from engine oil additives
- •Excessive oil consumption (worn rings/valve seals) loading the filter with ash
- •Use of non-low-ash (non-CJ-4/low-SAPS) engine oil
- •Repeated incomplete or failed regeneration cycles over time
- •Faulty DPF differential pressure sensor giving high restriction readings
- •Clogged or saturated DPF substrate requiring professional cleaning or replacement
P242F on Chevrolet by Model
Chevrolet Cruze(1 issue)
- Diesel Particulate Filter Soot Loading and Failed Regeneration - Limp Mode2014-2019
Cruze diesels driven on short trips never complete an active regeneration, so soot accumulates until the DPF restriction threshold is passed and the ECM drops the car into reduced power with a 'Diesel Particulate Filter Full' / Engine Power Is Reduced message and P2463. Once loading is high the ECM will also refuse to run a service regen, sometimes blocking it with an overtemperature-protection condition, which traps owners in a loop where neither driving nor the scan tool can clear it. Repeated interrupted regens also dilute engine oil with post-injected fuel.
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View P242F across all makes →Frequently Asked Questions
What does P242F mean on Chevrolet?▼
P242F stands for "Diesel Particulate Filter Restriction - Ash Accumulation (Bank 1)." P242F is a generic diesel emissions code indicating the engine control module has detected excessive restriction in the Diesel Particulate Filter (DPF) caused by ash accumulation rather than recoverable soot. Unlike soot, ash cannot be burned off through normal or forced regeneration, so this typically signals the DPF is reaching the end of its service life and needs cleaning or replacement. The condition reduces exhaust flow and can trigger reduced-power (limp) mode if left unaddressed. On Chevrolet specifically, this code is documented across 1 model.
What causes P242F on Chevrolet vehicles?▼
Common causes on Chevrolet: DPF at end of service life with accumulated non-combustible ash from engine oil additives, Excessive oil consumption (worn rings/valve seals) loading the filter with ash, Use of non-low-ash (non-CJ-4/low-SAPS) engine oil, Repeated incomplete or failed regeneration cycles over time, Faulty DPF differential pressure sensor giving high restriction readings. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P242F on a Chevrolet?▼
Repair costs on Chevrolet range from $400 to $3,000, depending on the specific model and root cause.
Which Chevrolet models have P242F documented?▼
Au7o has documented P242F on 1 Chevrolet model: Cruze.