SPN 3242
CAUTION
DPF intake temperature
The truck's control module (ECU) reports a fault on: DPF intake temperature.
SPN 3242 means a truck control module (ECU) flagged a fault on DPF intake temperature, part of the Aftertreatment / DPF system on heavy-duty diesel trucks. DERATE rates it CAUTION: you can keep driving carefully, but get it checked soon. Part usually replaced: DPF temperature sensor, $90–$350 (aftermarket to dealer) plus 0.5–1.5 h labor.
Aftertreatment / DPF
Can I keep driving?
Yes, carefully. It does not usually cut power, but get it checked soon.
Part usually replaced
DPF temperature sensor
$90–$350 (aftermarket to dealer)
Labor: 0.5–1.5 h
USD, part only. Labor is billed at the shop's hourly rate.
Data: DERATE verified base, updated October 2026
Related codes
Read it off your own dash
Take one photo and DERATE tells you whether you can keep driving.
Ask DERATE
DERATE assists. It does not replace inspection by a qualified technician.