Jeep B1DB4
Left Power Side Step Position Sensor - Signal Has Too Few Pulses / B1DB5-39 - Right Power Side Step Position Sensor - Signal Has Too F
Quick answer
B1DB4 identifies a left power side step position-sensor signal with too few pulses. Verified evidence also references B1DB5-39 for the right power side step position sensor with too few pulses.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
Watch Videos
Relevant videos play here without leaving this diagnostic page.
No sufficiently relevant embeddable video has been accepted for this diagnostic yet.
Videos are supporting material and never override OEM or regulator evidence.
1. What does B1DB4 mean?
B1DB4 identifies a left power side step position-sensor signal with too few pulses. Verified evidence also references B1DB5-39 for the right power side step position sensor with too few pulses.
2. Technical explanation
The supplied official NHTSA manufacturer communication evidence describes power side steps that may be stuck or inoperable in connection with B1DB4-39, defined as “Left Power Side Step Position Sensor - Signal Has Too Few Pulses.” The same evidence references B1DB5-39 for the right-side sensor. The available evidence does not establish a specific component failure mechanism, diagnostic procedure, or repair.
3. What system is affected?
Power side step system; specifically, the left power side step position-sensor signal.
4. How serious is this code?
Not yet established by verified evidence.
5. Symptoms you may notice
- The power side step may be stuck.
- The power side step may be inoperative.
6. Possible causes
- Not yet established by 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
- Avoid attempting electrical or mechanical repair of the power side step based on this information alone.
- Arrange professional diagnosis if the side step is stuck or inoperative.
10. Step-by-step troubleshooting
- Confirm the stored DTC with an appropriate diagnostic scan tool.
- Have a qualified service facility diagnose the power side step system. Further troubleshooting steps are not established by the supplied verified evidence.
11. When to contact service
Contact a Jeep-authorized service facility for diagnosis, particularly if the power side step is stuck or inoperative.
12. What the service center may check
- Verify whether B1DB4-39 is stored.
- Inspect and diagnose the power side step system according to applicable Jeep service information. Specific inspection steps are not established by the supplied evidence.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Jeep Wagoneer · 2026 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication 11033960: 9100818, published June 9, 2026. The supplied evidence associates B1DB4-39 with a left power side step position-sensor signal having too few pulses and notes that side steps may be stuck or inoperative.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified source: NHTSA Manufacturer Communication 11033960: 9100818, published June 9, 2026: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11033960
- NHTSA: NHTSA Manufacturer Communication 11033960: 9100818 · official_tsb
19. Frequently asked questions
What does Jeep code B1DB4 mean?
Verified evidence identifies B1DB4-39 as “Left Power Side Step Position Sensor - Signal Has Too Few Pulses.”
What vehicle applicability is verified?
The supplied database evidence lists a 2026 Jeep Wagoneer in the United States.
Can B1DB4 cause the power side step not to work?
The official communication states that power side steps may be stuck or inoperative due to the referenced DTCs, including B1DB4-39.
Is it safe to drive or charge with B1DB4?
Not yet established by verified evidence.