ECU Programming / Coding Agreement
– DTC Modification
This agreement applies to any request involving Diagnostic Trouble Code (DTC) modification, suppression, or removal. Proof of ownership is required before any work is carried out.
Service Provider
Diag Auto Clinic (DAC)
Client Details
Full Name
ID / Registration Number
Contact Number
Address
Vehicle Details
Make
Model
Year
VIN
Registration Number
1. Proof of Ownership
The Client confirms that valid proof of ownership of the above-mentioned vehicle has been provided and verified prior to any work being carried out.
2. Scope of Work
The Client has requested ECU programming / coding modifications, specifically relating to:
  • Diagnostic Trouble Code (DTC) modification, suppression, or removal
  • Associated ECU calibration changes where required
Prior to any modification, the following will be performed where technically possible:
  • Full readout and backup of original ECU data (BIN / calibration file)
  • Secure storage of original data for potential restoration
3. Nature of DTC Modification
The Client acknowledges that:
  • DTC modification may include disabling, masking, or altering fault reporting logic within the ECU
  • This may prevent certain faults from being logged, stored, or displayed
  • This does not constitute a repair of the underlying mechanical or electrical fault
4. Client Acknowledgement of Risks
The Client understands and accepts that:
  • Underlying faults may still exist and can worsen over time
  • Safety-related systems may be affected depending on ECU logic and DTC scope
  • The vehicle may operate outside manufacturer specifications
  • The vehicle may fail roadworthy inspections or compliance testing
  • The vehicle may be non-compliant with emissions regulations
  • Dashboard warnings may no longer reflect actual system status
  • Future diagnostics may be limited or misleading due to modified DTC behavior
5. Limitation of Liability
The Client agrees that Diag Auto Clinic (DAC) is not liable for:
  • Mechanical or electrical failure resulting from pre-existing conditions
  • Consequential damage arising after DTC modification
  • Misdiagnosis or delayed detection of faults due to suppressed DTCs
  • Any safety, legal, compliance, or insurance implications
  • Loss of manufacturer warranty (if applicable)
The Client assumes full responsibility for continued operation of the vehicle after modification.
6. Restoration
The Client acknowledges:
  • Original ECU data may be restored using the backed-up file (if available)
  • Restoration requires a return visit and may incur additional cost
  • Full restoration may not always revert all adaptations or learned values depending on ECU type
7. No Guarantee of Outcome
The Client understands that:
  • Results may vary depending on ECU type, software version, and system architecture
  • Some DTCs may not be fully suppressible without side effects
  • DAC does not guarantee complete elimination of all fault indicators or related symptoms
8. Declaration
I, the undersigned Client, confirm that:
  • I am the lawful owner or authorized representative of the vehicle
  • I have requested this service voluntarily
  • I understand that DTC modification is not a repair
  • I accept all associated risks and consequences
  • I release Diag Auto Clinic (DAC) from all liability related to this work
Client Signature
Name (Print)
Date
Technician (DAC)
Signature
Date
Diag Auto Clinic (DAC)
Automotive Diagnostics & ECU Programming Specialists