What do P2135 and P2138 together mean?

Treat the pair as two records to investigate, not as a diagnosis of one failed component. In Ford’s OBD summary for the gasoline model years 2024–2025 that it covers, P2135 is a throttle-position sensor A/B correlation record. P2138 is an accelerator-pedal position sensor D/E voltage-correlation record. The summary says these are separate monitored sensor relationships—not a single shared correlation test. [S1]

That description is specific to the Ford vehicles and model years covered by that document; it does not establish definitions or calibration details for every make and model. Even where the descriptions apply, the codes alone do not prove which component, connection, or other cause is responsible. A qualified diagnostic check needs the applicable vehicle service information and the vehicle’s details and scan context.

No. The pair does not, by itself, prove either part has failed. In the cited Ford summary, the codes refer to different sensor relationships; their appearing together is useful information for diagnosis, but it is not a confirmed cause. [S1]

Before anyone recommends a part, provide the exact year, make, model, and engine, plus whether each code is current, pending, or stored in the scan report. Include any freeze-frame information the scan tool captured. The Ford summary specifically says diagnosis requires applicable service information and those vehicle and scan details; it does not provide a universal repair procedure or identify a failed part for every code pair. [S1]

Make a compact handoff note without trying to diagnose or test the vehicle yourself. For example:

“Vehicle: [year] [make] [model], [engine]. Codes reported: P2135 [current/pending/stored/unknown] and P2138 [current/pending/stored/unknown]. Scan date: [date]. Freeze-frame information: [attach or summarize what the scan tool displayed]. Symptoms or warning messages noticed: [plain description and when they occurred]. Other codes: [list them or say none were reported].”

Use “unknown” rather than guessing. Keep the scan report if available, and tell the shop whether the codes were read before or after any work. These notes preserve context; they do not establish the cause.

Ask the shop to confirm how both codes apply to your exact vehicle, check the applicable service information, and explain what evidence supports any proposed repair. You can ask whether the scan record and freeze-frame context were considered, and whether the diagnosis accounts for both codes rather than assuming they identify one failed part.

Avoid authorizing a part solely because a code name mentions a sensor. Don’t attempt hazardous testing or bypass a vehicle control or emissions system. If you have a drivability concern, describe exactly what you notice and ask a qualified professional how to proceed. The cited Ford summary explains the two records only within its stated vehicle coverage; it does not establish a diagnosis, repair, or procedure for your particular vehicle. [S1]