C1252 on Ram
Hybrid brake booster or actuator fault (Toyota, Lexus) or vacuum pump control circuit (Chrysler, Jeep, Ram)
Severity: Inspect soon
Toyota bulletins tie C1252 to the brake, ABS or TRAC lights, and Toyota says to have the car inspected immediately when the ABS light is on; FCA ties it to the ESC light, which FCA says needs a dealer as soon as possible.
It gets more serious if:
- Stop: Stop in a safe place and call a dealer if the red brake warning light is on or the brake pedal feels different.
- Stop: On a Chrysler, Jeep or Ram, stop and have it checked immediately if the red brake warning light comes on.
This page covers only what differs on Ram. For what C1252 means, the ranked causes and the test order, see the C1252 guide.
What's different on Ram
RamYour car
2019–2026 · 1500
Supported by vehicle dataThe same FCA bulletin lists the 2019 and later Ram 1500 for C1252-92 with the ESC light. The bulletins are on NHTSA, but whether they are still current is not verified, so it is labelled vehicle data rather than confirmed.
Where it is:Electric vacuum pump
S1805000006Status unverified
ESC light on with C1252-92 vacuum pump control circuit and/or P258B electronic vacuum pump performance
2017–2020cherokee, wrangler, gladiator · issued · NHTSA 10173320
Covers the ESC light with C1252-92 or P258B on 2017–2020 Chrysler Pacifica, Jeep Cherokee, Wrangler and Gladiator, and 2019–2020 Ram 1500 in the cache. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
S1805000006 REV.BStatus unverified
ESC light on with C1252-92 vacuum pump control circuit and/or P258B electronic vacuum pump performance
2019–2026cherokee, wrangler, gladiator · issued · NHTSA 11025508
Revised version covering 2019–2023 Jeep Cherokee, 2019–2026 Wrangler and Wrangler 4xe, 2020–2026 Gladiator and 2019–2026 Ram 1500. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Sources and review
- FCA S1805000006: ESC light on, C1252-92 vacuum pump control circuit and/or P258B electronic vacuum pump performance
- FCA S1805000006 REV.B: ESC light on, C1252-92 vacuum pump control circuit and/or P258B electronic vacuum pump performance
- Toyota Camry Owner's Manual (OM06291U)
- Toyota T-SB-0024-19: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Prius, Prius Plug-in)
- Toyota T-SB-0032-16: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Prius, Highlander HV)
- 2022 Ram 2500/3500 Owner's Manual: ESC Activation/Malfunction Indicator Light
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error