Mitsubishi P0703
2011 & newer Outlander Sport/RVR. If you should encounter stoplight switch related DTCs (C1000, B1136, P0703), make sure you check the following items BEFORE following the relevant
Quick answer
For Mitsubishi vehicles covered by the supplied evidence, P0703 is listed as a stoplight-switch-related DTC. Before using the Service Manual diagnostic tree, Mitsubishi’s communication says to check CAN-bus operation and stoplight-switch adjustment.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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1. What does P0703 mean?
For Mitsubishi vehicles covered by the supplied evidence, P0703 is listed as a stoplight-switch-related DTC. Before using the Service Manual diagnostic tree, Mitsubishi’s communication says to check CAN-bus operation and stoplight-switch adjustment.
2. Technical explanation
The verified NHTSA-posted Mitsubishi manufacturer communication TT253 identifies P0703 together with C1000 and B1136 as stoplight-switch-related DTCs for 2011 and newer Outlander Sport/RVR. It directs technicians to check the CAN-bus line first and then check stoplight-switch adjustment before following the relevant DTC diagnostic tree. The communication states that an out-of-adjustment stoplight switch can cause other concerns, but the supplied evidence does not establish the full list of concerns or a complete root-cause list for P0703.
3. What system is affected?
Brake / body electrical: stoplight switch and CAN-bus line checks are identified by the verified manufacturer communication.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
Not yet established by verified evidence.
6. Possible causes
- Stoplight-switch adjustment should be checked before following the applicable Service Manual DTC diagnostic tree.
- CAN-bus line operation should be checked first when diagnosing the listed electrical concern.
- No further P0703 causes are established by the supplied verified evidence.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- Arrange diagnosis using the applicable Mitsubishi Service Manual procedure.
- Have a qualified technician check CAN-bus line operation and stoplight-switch adjustment.
- Do not attempt high-voltage repairs based on this DTC; no high-voltage fault or repair procedure is established by the supplied evidence.
10. Step-by-step troubleshooting
- 1. Check CAN-bus line operation. The manufacturer communication says this check is essential and is the first step when diagnosing electrical concerns.
- 2. Check stoplight-switch adjustment.
- 3. After those checks, follow the relevant DTC diagnostic tree in the applicable Service Manual.
11. When to contact service
Contact a Mitsubishi dealer or qualified repair facility for diagnosis if P0703 is present. The supplied evidence directs use of the applicable Service Manual diagnostic tree after the CAN-bus and stoplight-switch-adjustment checks.
12. What the service center may check
- Check CAN-bus line operation.
- Check stoplight-switch adjustment.
- Follow the relevant Service Manual DTC diagnostic tree after the above checks.
13. Possible repair or resolution
- Not yet established by verified evidence. The supplied communication provides preliminary diagnostic checks, not a confirmed repair for every P0703 occurrence.
14. Affected vehicles
- Mitsubishi Outlander · 2012–2020 · US
- Mitsubishi i-MiEV · 2012–2020 · US
15. Related TSBs / service bulletins
- Mitsubishi TT253, posted by NHTSA as Manufacturer Communication PDF 10169006, published November 26, 2019. It covers stoplight-switch-related DTCs C1000, B1136, and P0703 for 2011 and newer Outlander Sport/RVR and instructs CAN-bus and stoplight-switch-adjustment checks before using the DTC diagnostic tree.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified source: NHTSA Manufacturer Communication PDF 10169006, Mitsubishi TT253: https://static.nhtsa.gov/odi/tsbs/2019/MC-10169006-9999.pdf
- NHTSA: NHTSA Manufacturer Communication PDF 10169006: TT253 · official_tsb
19. Frequently asked questions
What does P0703 mean in the supplied Mitsubishi evidence?
It is identified as a stoplight-switch-related DTC when listed with C1000 and B1136 in Mitsubishi communication TT253.
What should be checked first?
The communication says to check CAN-bus line operation first. It describes this as essential and the first step for diagnosing electrical concerns.
Should stoplight-switch adjustment be checked?
Yes. Mitsubishi instructs technicians to check stoplight-switch adjustment before following the relevant Service Manual DTC diagnostic tree.
Is P0703 confirmed for every Mitsubishi model listed in the applicability data?
Not yet established by verified evidence. The supplied bulletin text specifically identifies 2011 and newer Outlander Sport/RVR, while the supplied applicability data lists 2012–2020 US Outlander and i-MiEV.