Troubleshooting Nissan Intelligent Cruise Control P1574 ASCD Code

You’re cruising down the highway, everything’s smooth, and then suddenly the cruise control drops out and a warning light blinks on your dash.

If you’ve scanned the codes and found P1574, you’re not alone. This is one of those codes that sounds scarier than it usually is—especially once you understand what it actually means and why Nissan’s system triggers it.

TL;DR: P1574 is an ASCD (Automatic Speed Control Device) Vehicle Speed Sensor code. It means your car’s computer (ECM) isn’t getting consistent speed data from two separate sources—the combination meter and the transmission control module. The good news? This code usually doesn’t cause a check engine light, and the fix is often straightforward once you know where to look.

Key takeaways:

• P1574 means the ECM sees a mismatch between two vehicle speed signals.
• The MIL (check engine light) typically does NOT come on for this code alone.
• Common causes include a faulty speed sensor, CAN communication issues, or moisture/corrosion in connectors.
• On some Nissan models (like the 2014 Rogue), this code pairs with transmission speed sensor problems.
• Diagnosis should always start by checking for related codes like U1000, P0500, or P0605.

What P1574 Actually Means for Your Nissan

Here’s the simple version: your Nissan’s ECM (Engine Control Module) relies on two independent vehicle speed signals to manage cruise control. One signal comes from the combination meter (your instrument cluster). The other comes from the TCM (Transmission Control Module).

When you set cruise control, the ECM compares these two signals. If they don’t match—or if one disappears—it throws P1574 and disables the system. That’s why the cruise indicator light starts blinking instead of just quietly failing.

Here’s an important detail: P1574 uses “one trip detection logic.” That means the ECM can flag it the very first time it sees a problem. It doesn’t wait for a pattern to develop.

The code itself won’t light up your check engine light. That’s actually helpful—it means this isn’t an emissions-related issue that’ll fail an inspection. But it still needs attention, especially if you rely on cruise control for long drives.

The Two-Signal Design: Why It Matters

Nissan engineers didn’t design this system to be difficult. They designed it to be safe.

By using two separate speed sources, the ECM can verify that the speed data it’s receiving is accurate. If one sensor fails or sends garbage data, the system knows something’s wrong. It’s a built-in sanity check.

But that also means P1574 can be triggered by problems in either signal path—or in the communication network (CAN bus) that carries those signals.

“The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from unified meter and A/C amp., and the other is from TCM.”

Common Causes of P1574

Based on Nissan’s own technical service bulletins and diagnostic procedures, here are the most likely culprits:

1. Faulty or contaminated speed sensor. On some models, particularly the 2014 Rogue, moisture and corrosion on the Secondary Speed Sensor pins can trigger P1574 alongside transmission codes. The fix there involves cleaning the connector and replacing the sensor.
2. CAN communication failure. If the wiring or modules that carry speed data are compromised, P1574 can appear alongside codes like U1000 or U1001.
3. Problems with the TCM. The transmission control module provides one of the speed signals. If it’s failing or throwing its own codes, P1574 is a natural side effect.
4. Combination meter issues. The instrument cluster sends the other speed signal. Faults here can cause the mismatch that triggers P1574.
5. ABS/VDC system problems. The ABS actuator and electric unit also play a role in speed data. Nissan’s diagnostic flow often checks this system before condemning the ECM itself.

Real-World Pattern: The 2014 Rogue Case

Nissan issued a specific technical bulletin for the 2014 Rogue (T32) where P1574 appeared alongside a cluster of transmission codes: P2765, P0500, P1715, or P0720.

The root cause? Moisture and corrosion on the Secondary Speed Sensor pins. The repair involved:

• Cleaning the harness connector with electrical cleaner
• Replacing the Secondary Speed Sensor (part #31935-1XF00)

This is a good reminder that P1574 rarely travels alone. If you see it with other codes, address those first.

How to Diagnose P1574 Step by Step

Nissan’s official diagnostic procedure follows a logical path. Here’s how a technician would approach it:

Step 1: Check for other DTCs first.
If P1574 appears with U1000, U1001 (CAN communication), P0500 (VSS), P0605 (ECM), or P0607, those codes take priority. Fix them first—P1574 might resolve on its own.

Step 2: Confirm the code.

• Start the engine with the VDC switch OFF.
• Drive above 40 km/h (25 MPH).
• Check for P1574.

Step 3: Check DTCs with the TCM.
The TCM provides one of the speed signals. If it has its own codes, address those.

Step 4: Check the ABS actuator and electric unit.
This system also feeds speed data into the network. Any faults here need attention before moving on.

Step 5: Check the combination meter.
If TCM and ABS are clean, the instrument cluster becomes the suspect. Nissan’s procedure includes checking the meter’s function and, in some cases, replacing it.

Step 6: Look for intermittent issues.
Wiring problems, loose connectors, or moisture can cause P1574 to come and go. Nissan’s diagnostic flow includes an “Intermittent Incident” check before condemning any module.

What You Can Check Yourself

If you’re comfortable with basic DIY diagnostics:

• Inspect speed sensor connectors for moisture, corrosion, or loose pins.
• Look for aftermarket accessories that might interfere with CAN communication (some cheap OBD dongles cause network issues).
• Check for recent work—a loose connector from previous repairs could be the culprit.
• Scan for all codes, not just engine codes. Transmission and ABS modules often store the real clues.

Always disconnect the battery before working on electrical connectors. And if you’re not confident with vehicle electronics, a Nissan-certified technician is the safest path.

Why This Code Matters Beyond Cruise Control

Here’s something worth knowing: the vehicle speed signals that feed cruise control also support other systems. Your speedometer, odometer, transmission shift logic, and even some safety features rely on accurate speed data.

So while P1574 disables cruise control, the underlying issue could affect other things you haven’t noticed yet. That’s why Nissan doesn’t just ignore it—and neither should you.

Did you know that Nissan’s Intelligent Cruise Control can work alongside ProPILOT Assist to handle stop-and-go traffic? The system uses radar and camera data to maintain distance automatically, even bringing the car to a complete stop in some conditions.

FAQ: Nissan P1574 ASCD Code

Q: Will P1574 cause my check engine light to come on?

No. Nissan’s documentation clearly states that this self-diagnosis does not light the MIL (Malfunction Indicator Lamp). You might see a blinking cruise indicator instead, but the check engine light stays off for P1574 alone.

Q: Can I still drive with P1574?

Yes, but cruise control won’t work. The car is safe to drive—the code doesn’t indicate a safety hazard. However, you should address it soon, especially if other codes are present.

Q: What is “ASCD”?

ASCD stands for Automatic Speed Control Device. It’s Nissan’s internal term for the cruise control system. When you see P1574, it specifically refers to the speed sensor signal used by ASCD.

Q: Why does P1574 sometimes appear with transmission codes?

On some models (like the 2014 Rogue), a single faulty component—such as the Secondary Speed Sensor—can trigger multiple codes because the transmission and cruise control systems share speed data. Fixing the sensor resolves all of them.

Q: How much does it cost to fix?

It depends on the cause. A sensor replacement is typically the least expensive fix. If a module (TCM, ECM, combination meter) needs replacement, costs go up. Diagnosis is key—don’t throw parts at it.

Q: Can a weak battery cause P1574?

Yes, low voltage can cause communication glitches that trigger speed signal mismatches. If your battery is old or you’ve had starting issues, test it before pursuing complex diagnostics.

Q: Does this affect ProPILOT Assist?

P1574 specifically affects the ASCD (cruise control) function. ProPILOT Assist uses additional sensors (radar, camera) and may throw different codes if those systems have issues. However, since ProPILOT Assist builds on cruise control, a P1574 could disable the adaptive cruise portion of ProPILOT.

References

• Nissan Technical Service Bulletin: 2014 Rogue MIL On With DTC P2765, P0500, P1574, P1715 or P0720 – Official Nissan bulletin linking P1574 to Secondary Speed Sensor moisture/corrosion
• Nissan 2003 Murano P1574 Diagnostic Procedure – Detailed component description and confirmation procedure
• Nissan 350Z P1574 Diagnostic Guide – Shows MIL non-illumination and DTC confirmation steps
• Nissan 2012 Armada P1574 Diagnosis – Step-by-step diagnostic flow for TCM, ABS, and meter checks
• Nissan Intelligent Cruise Control System Overview – How ICC maintains distance and speed using sensor data
• Nissan 2024 Ariya Cruise Control Precautions – Modern Nissan guidance on cruise indicator blinking and system checks

Have you dealt with a P1574 code on your Nissan? What ended up being the fix? Share your experience in the comments below—it might help another driver!