Need help RLX Permanent DTC Codes
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1st Gear
Joined: May 2026
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Need help RLX Permanent DTC Codes
I’m planning to buy a used 2018 Acura RLX Technology Package.
I had a mobile PPI done because the dealership only allows on-site inspections, which I understand. The PPI mechanic also scanned the car and shared the diagnostic report. The scan showed 6 DTCs, and all of them were listed as “Permanent DTC.”
I’m still learning about this, so I had to rely mostly on the PPI mechanic. My main question is: what exactly do Permanent DTC codes mean?
When I asked the dealership, they said these are not active/live codes. They said Permanent DTCs usually refer to past codes and mentioned that the car had been sitting idle for around 6 months before they bought it from their customer. According to them, the battery may have died or gotten weak during that time, which could have triggered these codes.
However, the PPI mechanic said he has not really seen permanent codes like this before, so he is not completely sure whether Permanent DTCs always mean past codes and definitely not active/live issues.
I do not want to rely only on the dealership’s explanation. Can any RLX owners or Acura/Honda techs confirm whether Permanent DTC codes usually mean past/non-active codes, or whether they can still indicate a current issue?
I have included the scan output below.Here is a copy/paste ASCII version that closely resembles the TOPDON report layout:
I had a mobile PPI done because the dealership only allows on-site inspections, which I understand. The PPI mechanic also scanned the car and shared the diagnostic report. The scan showed 6 DTCs, and all of them were listed as “Permanent DTC.”
I’m still learning about this, so I had to rely mostly on the PPI mechanic. My main question is: what exactly do Permanent DTC codes mean?
When I asked the dealership, they said these are not active/live codes. They said Permanent DTCs usually refer to past codes and mentioned that the car had been sitting idle for around 6 months before they bought it from their customer. According to them, the battery may have died or gotten weak during that time, which could have triggered these codes.
However, the PPI mechanic said he has not really seen permanent codes like this before, so he is not completely sure whether Permanent DTCs always mean past codes and definitely not active/live issues.
I do not want to rely only on the dealership’s explanation. Can any RLX owners or Acura/Honda techs confirm whether Permanent DTC codes usually mean past/non-active codes, or whether they can still indicate a current issue?
I have included the scan output below.Here is a copy/paste ASCII version that closely resembles the TOPDON report layout:
Code:
================================================================================
ACURA-ACURA RLX-2018_维修前_FULL SYSTEM REPORT
================================================================================
SN: 11024415A1002J
Repair Shop: --
Report Number: TOPDON1779477181
Phone Number: --
Date Created: 2026-05-22 15:13:01
Address: --
Scan me!
================================================================================
VEHICLE INFORMATION
================================================================================
Plate Number: --
Diagnostic Time: 2026-05-22 15:13:01
Make: ACURA
Vehicle Software Version: V2.60
Model: ACURA RLX
Diagnostic Application Ver: V3.70.003
Year: 2018
VIN: -------
Mileage: ---- km
Diagnostic Scan Path: Automatic > USA > ACURA RLX > 2018
Engine: --
Customer: --
Sub Model: --
Customer Tel.: --
Technician: --
Technician Phone: --
Ticket No.: --
================================================================================
SUMMARY
================================================================================
19 systems were scanned, and 4 of them were detected with DTCs.
Altogether 6 DTCs were found.
For safe driving, please read the report carefully and perform related repair
in a timely manner.
================================================================================
FULL SYSTEM REPORT (19) - PRE-SCAN
================================================================================
+----+-------------------------------------------------------------+-------------+
| No | System | Status |
+----+-------------------------------------------------------------+-------------+
| 1 | PGM-FI (Programmed Fuel Injection) | No fault |
| 2 | ACM (Auxiliary Control Module) | No fault |
| 3 | AT (Automatic Transmission) | No fault |
| 4 | ABS (Anti-Lock Braking System) | No fault |
| 5 | SRS | No fault |
| 6 | SWS | No fault |
| 7 | EPT (E-Pretensioner) | No fault |
| 8 | EPB (Electronic Parking Brake) | No fault |
| 9 | EPS (Electronic Power Steering) | Fault 1 |
| 10 | BODY ELECTRICAL | Fault 3 |
| 11 | Gauge Control Module (Diag-CAN) | No fault |
| 12 | TPMS (Tire Pressure Monitoring) | No fault |
| 13 | CAN Gateway | No fault |
| 14 | One-Push Start (PCU) | No fault |
| 15 | One-Push Start (BACKUP ECU) | No fault |
| 16 | KEYLESS ACCESS System | No fault |
| 17 | Integrated Driver Support System | No fault |
| 18 | Blind Spot Information / Cross Traffic Monitor | Fault 1 |
| 19 | Precision All Wheel Steer | Fault 1 |
+----+-------------------------------------------------------------+-------------+
================================================================================
1. EPS (ELECTRONIC POWER STEERING)
================================================================================
+-------------+-----------------------------------------------+----------------+
| DTC | Description | Status |
+-------------+-----------------------------------------------+----------------+
| U0416-68 | VSA System Malfunction | Permanent DTC |
+-------------+-----------------------------------------------+----------------+
================================================================================
2. BODY ELECTRICAL
================================================================================
+-------------+-----------------------------------------------+----------------+
| DTC | Description | Status |
+-------------+-----------------------------------------------+----------------+
| U0199 | MICU lost communication with power window | Permanent DTC |
| | master switch | |
+-------------+-----------------------------------------------+----------------+
| B1A06 | Auto High-Beam (High-Beam Support System) | Permanent DTC |
| | camera blocked failure | |
+-------------+-----------------------------------------------+----------------+
| U0199 | Power seat control unit lost communication | Permanent DTC |
| | with PW master SW | |
+-------------+-----------------------------------------------+----------------+
================================================================================
3. BLIND SPOT INFORMATION / CROSS TRAFFIC MONITOR
================================================================================
+-------------+-----------------------------------------------+----------------+
| DTC | Description | Status |
+-------------+-----------------------------------------------+----------------+
| B18DB | Left Side BSI Radar Unit Received The | Permanent DTC |
| | Audio/Navigation Unit Failure Information | |
+-------------+-----------------------------------------------+----------------+
================================================================================
4. PRECISION ALL WHEEL STEER
================================================================================
+-------------+-----------------------------------------------+----------------+
| DTC | Description | Status |
+-------------+-----------------------------------------------+----------------+
| C1621-13 | Right-Rear Precision All Wheel Steer | Permanent DTC |
| | Actuator Circuit Open | |
+-------------+-----------------------------------------------+----------------+
================================================================================
DISCLAIMER
================================================================================
This diagnostic report is provided for the purpose of displaying diagnostic
data and is for reference only. It does not constitute any judgment,
conclusion, or basis for action. The Company shall not be liable for any
decisions or actions taken by the user based on the content of this report.
When a user chooses to save the diagnostic report in the app, the relevant
report content will be stored in accordance with the app's functional
requirements for the purpose of subsequent access.
================================================================================
END OF REPORT
================================================================================
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