P1749 Hyundai Code - Serial Communication Link
Quick Answer
P1749 Hyundai indicates Serial Communication Link. Common causes for P1749 Hyundai include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1749 Hyundai indicates Serial Communication Link.
- Common causes
- Common causes for P1749 Hyundai include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1749 Hyundai Description
How to Fix the DTC P1749 Hyundai?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1749 Hyundai code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1749 Hyundai Code
1. What does the P1749 code mean on a Hyundai?
The P1749 code indicates a "Serial Communication Link" fault, which means there is an issue with the communication between the transmission control module (TCM) and other control modules.
2. What are the common symptoms of the P1749 code in a Hyundai?
Symptoms may include the transmission going into limp mode, poor shifting performance, a check engine light, or erratic transmission behavior.
3. What causes the P1749 code to appear?
Common causes include a faulty TCM, damaged wiring or connectors in the communication circuit, software issues, or a failed powertrain control module (PCM).
4. Can I drive my Hyundai with the P1749 code?
Driving with the P1749 code is not recommended, as it can cause further damage to the transmission or other systems if left unresolved.
5. How do I diagnose the P1749 code on a Hyundai?
Diagnosis typically involves scanning for additional codes, inspecting the wiring and connectors for damage, testing the TCM, and verifying communication signals between modules.
6. What tools are needed to fix the P1749 code?
You may need an OBD-II scanner, a multimeter for electrical testing, wiring diagrams, and possibly specialized diagnostic equipment for the TCM.
7. How much does it cost to repair the P1749 code on a Hyundai?
Repair costs vary but may range from $100 to $1,000 depending on whether the issue is a simple wiring repair or requires replacing the TCM or PCM.
8. Can a software update fix the P1749 code on a Hyundai?
In some cases, a software update for the TCM or PCM can resolve the code if the issue is related to outdated or corrupted firmware.
9. What should I check first when troubleshooting the P1749 code?
Start by inspecting the wiring and connectors between the TCM and PCM for signs of damage, corrosion, or loose connections.
10. Does the P1749 code require replacing the TCM?
Not always. The TCM should be tested thoroughly before replacing it, as the issue could be with wiring, connectors, or software rather than the module itself.
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